instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
bmZKWkYPqugcvzbHykblPzQLhK, tPUzKqugcvzbHypzk
answer:
qugcvzbHy


question:
wNiHcaiUPHnjp, aSTmjcaiUPHFzOu
answer:
caiUPH


question:
JRYayHMNI, wlqayHMfSo
answer:

ayHM