lua, 75 bytes

Result

AC

Duration

910ms

Code [DL]

::x::a,b=io.read("*n","*n")c=a%10 print(c==a%100//10 and c or b//100)goto x

stdin

791 159
726 224
432 233
127 776
947 992
799 983
437 375
856 461
237 731
626 226
985 557
755 665
541 413
611 115
655 557
324 721
822 833
369 641
139 917
515 377
912 376
723 537
448 141
169 637
647 334
544 135
453 514
677 991
788 189
755 323
233 324
599 795

stdout

1
2
2
7
9
9
3
4
7
2
5
5
4
1
5
7
2
6
9
3
3
5
1
6
3
4
5
7
8
5
3
9

stderr

/usr/bin/lua5.3: /volume/CODE:1: attempt to perform arithmetic on a nil value (global 'a')
stack traceback:
	/volume/CODE:1: in main chunk
	[C]: in ?

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd56be8aa0 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5556073a8d30 /* 7 vars */ <unfinished ...>
12    execve("/usr/bin/lua5.3", ["/usr/bin/lua5.3", "/volume/CODE"], 0x5556073a8d40 /* 7 vars */ <unfinished ...>
11    <... execve resumed>)             = 0
12    <... execve resumed>)             = 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    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=0, si_stime=0} ---
10    +++ exited with 1 +++