python3, 173 bytes

Result

WA

Duration

795ms

Code [DL]

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

stdin

755 517
978 744
455 452
885 595
855 356
477 489
689 986
846 468
211 556
943 438
669 774
155 559
861 221
642 386
653 551
937 221
992 997
633 586
741 149
199 948
139 897
749 995
945 264
134 418
395 961
141 749
799 112
142 228
156 457
266 662
298 368
131 414

stdout

5
1
1
5
1
1
9
1
1
1
7
5
2
1
5
2
9
1
1
9
1
9
1
4
1
1
1
2
1
6
1
1

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"], 0x7ffd487c3350 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5632cc96fd38 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/volume/CODE"], 0x5632cc96fd50 /* 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 +++