python3, 175 bytes

Result

WA

Duration

862ms

Code [DL]

while True:
    a,b=map(int,input().split())
    if a%111!=0 and a%100%11==0:print(a%10)
    elif b//10%11==0:print(b//100)
    elif a%10==b//100:print(a%10)
    else:print(1)

stdin

764 663
113 326
732 315
961 866
711 889
854 172
377 776
748 443
619 191
455 131
977 473
477 283
932 852
195 655
527 218
566 559
851 224
183 937
598 895
513 133
154 455
287 386
315 498
996 672
588 841
188 485
995 551
566 651
548 558
966 663
373 446
996 668

stdout

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

stderr

Traceback (most recent call last):
  File "/volume/CODE", line 2, in <module>
    a,b=map(int,input().split())
EOFError: EOF when reading a line

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc0f0faff0 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55d99692ed38 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/volume/CODE"], 0x55d99692ed50 /* 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 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=1, si_stime=0} ---
10    +++ exited with 1 +++