v-vim, 26 bytes

Result

WA

Duration

854ms

Code [DL]

:%s/.*\(.\)\(\1\| \).*/\1/

stdin

468 886
164 414
214 718
552 959
272 949
639 834
466 557
911 137
855 255
717 522
177 154
963 937
127 219
633 437
247 471
182 228
377 334
416 113
588 886
348 842
717 114
452 236
145 889
889 695
654 779
948 842
174 261
771 739
276 764
155 556
166 528
522 211

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffee3e59d70 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55989229dd00 /* 9 vars */) = 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    execve("/root/V/v", ["/root/V/v", "/volume/CODE", "-f", "/tmp/input"], 0x55989229dd38 /* 9 vars */) = 0
14    execve("/usr/bin/readlink", ["readlink", "-e", "--", "/root/V/v"], 0x55623c727c20 /* 10 vars */) = 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=0} ---
13    execve("/usr/bin/dirname", ["dirname", "--", "/root/V/v"], 0x55623c7273c0 /* 10 vars */) = 0
13    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
15    execve("/usr/bin/vim", ["vim", "-Nnes", "/tmp/input", "-u", "/root/V/vim/init.vim", "-i", "NONE", "-c", "call Execute_Program('/volume/CO"..., "-c", "%p", "-c", "q!"], 0x55623c726bc0 /* 11 vars */ <unfinished ...>
16    execve("/usr/bin/head", ["head", "-c", "-1"], 0x55623c726bc0 /* 11 vars */ <unfinished ...>
15    <... execve resumed>)             = 0
16    <... execve resumed>)             = 0
15    +++ exited with 0 +++
16    +++ exited with 0 +++
12    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=15, si_uid=0, si_status=0, si_utime=2, 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=0, si_stime=0} ---
10    +++ exited with 0 +++