oh, 110 bytes

Result

AC

Duration

1049ms

Code [DL]

define a:readline
define b:$a::slice 1 2
if(eq $b ($a::slice 2 3)){
echo $b
}else:echo:$a::slice 4 5
source $0

stdin

421 615
734 232
211 227
829 996
913 758
838 836
655 572
233 691
857 456
697 123
538 448
358 546
149 447
669 645
724 415
188 331
511 218
531 992
289 996
788 887
975 957
657 479
788 884
634 327
664 642
744 242
738 836
711 161
287 878
657 737
144 374
861 668

stdout

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

stderr

CODE: 2: error/runtime: slice starts after last element

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc6f899b70 /* 7 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x5571aaf13048 /* 7 vars */) = 0
12    +++ exited with 0 +++
14    execve("/usr/bin/go", ["/usr/bin/go", "env", "GOPATH"], 0x5571aaf13078 /* 7 vars */) = 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} ---
18    +++ exited with 0 +++
17    +++ exited with 0 +++
15    +++ exited with 0 +++
16    +++ exited with 0 +++
14    +++ exited with 0 +++
13    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
13    execve("/root/go/bin/oh", ["/root/go/bin/oh", "/volume/CODE"], 0x5571aaf13068 /* 7 vars */) = 0
24    +++ exited with 0 +++
23    +++ exited with 0 +++
22    +++ exited with 0 +++
21    +++ exited with 0 +++
19    +++ exited with 0 +++
20    +++ exited with 0 +++
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=4, si_stime=6} ---
11    +++ exited with 0 +++