wren, 89 bytes

Result

AC

Duration

792ms

Code [DL]

import"io"for Stdin
for(s in 0..31){
s=Stdin.readLine()
System.print(s[s[1]==s[2]?1:4])
}

stdin

652 723
598 983
355 559
142 485
799 119
144 469
648 811
267 772
188 939
459 767
712 993
559 267
265 521
244 343
576 715
125 853
574 448
341 412
957 553
211 447
633 358
175 598
945 447
835 664
134 131
255 416
878 878
628 823
597 311
455 552
572 871
822 627

stdout

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

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe9db87170 /* 9 vars */) = 0
12    execve("/root/wren", ["/root/wren", "/volume/CODE"], 0x5616c7f3dd40 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5616c7f3dd30 /* 9 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 +++