instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
DQVkAbWTTPhoBx, TeWTTPhonxcIKL
answer:
WTTPho


question:
ScUCglVzZFPjLVofNHOumU, mNodEXwpZFPjLVofYfSnBM
answer:
ZFPjLVof


question:
qYtYjDXtPcbkmk, sAbIyDXtPcDQ
answer:

DXtPc