make, 161 bytes

Result

WA

Duration

776ms

Code [DL]

1=$(STDIN)
f=$(if $1,$(word 2,$(filter $(wordlist 3,4,$1),$1))$(call f,$(wordlist 7,999,$1)))
a:;$(foreach d,1 2 3 4 5 6 7 8 9,$(eval 1:=$$(subst $d, $d,$$1)))$f

stdin

788 884
445 451
614 949
994 463
689 993
246 665
479 271
859 221
542 246
177 277
291 995
415 113
929 558
938 394
544 729
144 143
248 199
188 844
252 456
122 116
544 886
183 323
742 422
727 933
862 521
137 391
621 686
653 225
299 838
199 916
188 887
186 685

stdout

84949622271598441822432757129986

stderr

make: 84949622271598441822432757129986: No such file or directory
make: *** [/volume/CODE:3: a] Error 127

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe2671eb00 /* 7 vars */) = 0
13    execve("/usr/bin/ag_launcher", ["/usr/bin/ag_launcher", "-i", "/usr/bin/make", "-f", "/volume/CODE"], 0x55636b4120a8 /* 7 vars */ <unfinished ...>
12    execve("/bin/cat", ["cat", "-"], 0x55636b412028 /* 7 vars */ <unfinished ...>
13    <... execve resumed>)             = 0
12    <... execve resumed>)             = 0
13    execve("/usr/bin/make", ["/usr/bin/make", "-f", "/volume/CODE"], 0x561757152da0 /* 8 vars */) = 0
12    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    +++ exited with 2 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=2, si_utime=0, si_stime=0} ---
11    +++ exited with 2 +++