lua, 46 bytes

Result

WA

Duration

789ms

Code [DL]

::a::print(io.read():match"(.) ?%1"or 1)goto a

stdin

599 992
438 285
288 871
563 965
211 885
633 374
277 339
489 894
736 338
899 995
825 194
667 277
536 334
145 113
488 492
273 378
817 717
611 851
911 611
261 612
574 738
746 339
762 791
357 857
897 734
844 941
261 768
594 731
427 778
618 886
339 917
129 277

stdout

9
1
8
1
1
3
7
1
3
9
1
6
3
1
8
3
7
1
1
1
1
3
1
1
7
4
1
1
7
8
3
7

stderr

/usr/bin/lua5.3: /volume/CODE:1: attempt to index a nil value
stack traceback:
	/volume/CODE:1: in main chunk
	[C]: in ?

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc6abeac60 /* 7 vars */) = 0
12    execve("/usr/bin/lua5.3", ["/usr/bin/lua5.3", "/volume/CODE"], 0x55b2ab272d40 /* 7 vars */ <unfinished ...>
11    execve("/bin/cat", ["cat", "-"], 0x55b2ab272d30 /* 7 vars */ <unfinished ...>
12    <... execve resumed>)             = 0
11    <... 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 +++