golfscript, 23 bytes

Result

AC

Duration

833ms

Code [DL]

n%{.1=\.2=@=1 4if=48-}%

stdin

685 112
994 949
471 771
355 256
989 391
497 376
659 198
237 886
293 648
121 226
466 616
622 771
494 466
377 773
188 998
836 611
277 713
377 848
867 776
931 737
393 442
292 594
734 378
269 258
235 356
645 542
153 359
875 553
744 448
199 812
955 152
678 717

stdout

19753318626247867777453235354957

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc0a3be750 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55e050f15d70 /* 9 vars */) = 0
12    execve("/usr/local/ruby-2.7.1/bin/ruby", ["/usr/local/ruby-2.7.1/bin/ruby", "/root/golfscript.rb", "/volume/CODE"], 0x55e0519aa028 /* 9 vars */ <unfinished ...>
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 resumed>)             = 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=3} ---
10    +++ exited with 0 +++