standback, 38 bytes

Result

AC

Duration

1063ms

Code [DL]

g/.+(.)(\1| ).+/%1/m/[\s\S]*/S//%%&///

stdin

373 515
359 597
267 443
689 599
544 747
291 616
257 158
466 661
282 882
811 461
855 991
481 114
718 857
611 115
466 621
191 669
144 542
195 554
163 628
122 185
427 361
599 962
276 673
831 339
975 988
882 242
683 797
725 254
746 541
294 495
161 694
722 663

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffed7d0c420 /* 9 vars */) = 0
12    execve("/usr/local/ruby-2.7.1/bin/ruby", ["/usr/local/ruby-2.7.1/bin/ruby", "/root/standback/src/standback.rb", "/volume/CODE"], 0x55f60fb46050 /* 9 vars */ <unfinished ...>
11    execve("/bin/cat", ["cat", "-"], 0x55f60fb46028 /* 9 vars */) = 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 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=6, si_stime=1} ---
10    +++ exited with 0 +++