instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
answer:
UKLTNLJbMK


question:
DGvUCrUVlUnQBShkWnfnceGasvI, NfzGUnQBShkWnpLMnY
answer:
UnQBShkWn


question:
cxGLpJjdekmBqERKhht, dzBdnJjdekmBqZZT
answer:

JjdekmBq