golang, 100 bytes

Result

AC

Duration

1651ms

Code [DL]

package main
import."fmt"
func main(){for{a,b:=0,0;Scan(&a,&b);if 0/a+b%110<9{a=b/100};Print(a%10)}}

stdin

977 673
231 311
715 511
869 665
468 875
651 722
585 852
582 996
311 116
566 648
878 887
183 289
866 619
155 776
399 163
992 989
861 882
244 883
322 389
476 668
473 321
853 632
813 117
544 542
962 614
799 952
241 315
833 331
364 264
787 783
882 651
749 241

stdout

71568159168367928826331429134729

stderr

panic: runtime error: integer divide by zero

goroutine 1 [running]:
main.main()
	/tmp/code.go:3 +0x1f1

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fffca024330 /* 7 vars */) = 0
11    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x558f880dbd18 /* 7 vars */) = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    execve("/bin/ln", ["ln", "-sf", "/volume/CODE", "/tmp/code.go"], 0x558f880dbd38 /* 7 vars */) = 0
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    execve("/usr/bin/go", ["/usr/bin/go", "build", "-o", "/tmp/code", "/tmp/code.go"], 0x558f885a8028 /* 7 vars */) = 0
20    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc000110b60 /* 25 vars */) = 0
21    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc000126340 /* 25 vars */) = 0
24    +++ exited with 0 +++
23    +++ exited with 0 +++
25    +++ exited with 0 +++
22    +++ exited with 0 +++
20    +++ exited with 0 +++
15    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=20, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
27    execve("/usr/lib/go/pkg/tool/linux_amd64/asm", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc000110d00 /* 25 vars */) = 0
29    +++ exited with 0 +++
30    +++ exited with 0 +++
28    +++ exited with 0 +++
21    +++ exited with 0 +++
16    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
31    execve("/usr/lib/go/pkg/tool/linux_amd64/asm", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc0001264e0 /* 25 vars */) = 0
34    +++ exited with 0 +++
32    +++ exited with 0 +++
33    +++ exited with 0 +++
27    +++ exited with 0 +++
26    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=27, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
35    +++ exited with 0 +++
37    +++ exited with 0 +++
36    +++ exited with 0 +++
31    +++ exited with 0 +++
19    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=31, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
38    execve("/usr/lib/go/pkg/tool/linux_amd64/compile", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-o", "/tmp/go-build206379622/b001/_pkg"..., "-trimpath", "/tmp/go-build206379622/b001=>", "-p", "main", "-complete", "-buildid", "yyWZbhveptcf_UPDgXgL/yyWZbhveptc"..., "-goversion", "go1.13.10", "-D", "_/tmp", "-importcfg", "/tmp/go-build206379622/b001/impo"..., "-pack", "-c=2", "/tmp/code.go"], 0xc000362410 /* 25 vars */) = 0
40    +++ exited with 0 +++
42    +++ exited with 0 +++
39    +++ exited with 0 +++
41    +++ exited with 0 +++
38    +++ exited with 0 +++
15    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=38, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
43    execve("/usr/lib/go/pkg/tool/linux_amd64/link", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-V=full"], 0xc000362820 /* 25 vars */) = 0
46    +++ exited with 0 +++
45    +++ exited with 0 +++
44    +++ exited with 0 +++
43    +++ exited with 0 +++
15    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=43, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
47    execve("/usr/lib/go/pkg/tool/linux_amd64/link", ["/usr/lib/go/pkg/tool/linux_amd64"..., "-o", "/tmp/go-build206379622/b001/exe/"..., "-importcfg", "/tmp/go-build206379622/b001/impo"..., "-buildmode=exe", "-buildid=VOVG4mmTao6kFWo5VFaU/yy"..., "-extld=gcc", "/tmp/go-build206379622/b001/_pkg"...], 0xc000362d00 /* 25 vars */) = 0
51    +++ exited with 0 +++
50    +++ exited with 0 +++
49    +++ exited with 0 +++
48    +++ exited with 0 +++
47    +++ exited with 0 +++
15    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=47, si_uid=0, si_status=0, si_utime=18, si_stime=5} ---
26    +++ exited with 0 +++
19    +++ exited with 0 +++
18    +++ exited with 0 +++
17    +++ exited with 0 +++
16    +++ exited with 0 +++
15    +++ exited with 0 +++
14    +++ exited with 0 +++
13    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=7, si_stime=13} ---
52    execve("/bin/cat", ["cat", "-"], 0x558f880dbd08 /* 7 vars */) = 0
53    execve("/tmp/code", ["/tmp/code"], 0x558f880dbcf0 /* 7 vars */) = 0
52    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=52, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
54    +++ exited with 2 +++
56    +++ exited with 2 +++
57    +++ exited with 2 +++
55    +++ exited with 2 +++
53    +++ exited with 2 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=53, si_uid=0, si_status=2, si_utime=0, si_stime=0} ---
58    execve("/bin/rm", ["rm", "/tmp/code.go", "/tmp/code"], 0x558f880dbcf0 /* 7 vars */) = 0
58    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=58, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
10    +++ exited with 0 +++