backhand, 21 bytes

Result

AC

Duration

861ms

Code [DL]

i&+i*o:-ii&iE:i$i0i~j

stdin

353 331
895 346
949 978
591 261
187 873
877 731
761 662
927 479
622 987
964 648
791 125
811 336
643 338
965 664
655 778
544 978
377 778
141 144
441 476
369 592
331 341
266 657
926 822
522 922
574 696
644 442
626 822
199 493
513 731
476 677
589 226
945 335

stdout

33928764261136547145368264897623

stderr

Tried to print invalid value (-1) as character

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffda7a07940 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x558c1f4ddd80 /* 7 vars */ <unfinished ...>
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/root/Backhand/Backhand_Interpre"..., "/volume/CODE"], 0x558c200f0050 /* 7 vars */ <unfinished ...>
11    <... execve resumed>)             = 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 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=2, si_stime=1} ---
10    +++ exited with 1 +++