golfscript, 21 bytes

Result

WA

Duration

913ms

Code [DL]

8/{(;4<n*~.@=@@if}%n*

stdin

338 557
533 334
517 712
937 366
194 496
244 488
437 775
815 747
961 388
959 597
665 557
655 457
886 739
768 267
495 996
327 171
254 856
366 994
528 931
356 542
246 449
633 338
577 985
378 117
277 887
525 573
447 979
311 314
766 698
878 787
251 199
311 822

stdout

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

stderr

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd8af4f420 /* 9 vars */) = 0
12    execve("/bin/cat", ["cat", "-"], 0x555a23ff0d70 /* 9 vars */) = 0
13    execve("/usr/local/ruby-2.7.1/bin/ruby", ["/usr/local/ruby-2.7.1/bin/ruby", "/root/golfscript.rb", "/volume/CODE"], 0x555a25adb028 /* 9 vars */) = 0
12    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=6, si_stime=2} ---
11    +++ exited with 0 +++