perl, 26 bytes

Result

AC

Duration

886ms

Code [DL]

/(.)\1 | (.)/,print$+for<>

stdin

866 669
577 227
378 843
469 451
755 223
913 132
611 122
868 646
646 247
877 981
734 343
986 973
196 686
877 873
613 936
642 778
455 556
291 895
899 698
522 512
965 776
362 744
966 611
493 437
692 987
661 118
144 697
157 756
427 727
454 556
717 778
148 447

stdout

67845116273967975892776491477574

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7fff25b8baf0 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55c3e0edad30 /* 7 vars */) = 0
12    execve("/usr/bin/perl", ["/usr/bin/perl", "/volume/CODE"], 0x55c3e0edad40 /* 7 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    +++ 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 +++