fish, 41 bytes

Result

AC

Duration

1134ms

Code [DL]

7d*2d*>:?!;$:i)n$1-v
      ^            <

stdin

aBcdEfGHIJKlMNOPqrsTuvwXYZ

stdout

01001011111011110001000111

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff9f3bc800 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/root/fish.py", "/volume/CODE"], 0x561886f68028 /* 7 vars */ <unfinished ...>
11    execve("/bin/cat", ["cat", "-"], 0x561885aded68 /* 7 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=7, si_stime=2} ---
10    +++ exited with 0 +++