instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
OBzHWjmkcgVGPyv, gCHWjmkcgVMq
answer:
HWjmkcgV


question:
EeUODjkxsQeTSNsHYpBKIUvEuAKhB, SrpZeTSNsHYpBKdhPFlgMh
answer:
eTSNsHYpBK


question:
BVrWwazHBrWCddOY, wtxjzHBrWCIUFDJ
answer:

zHBrWC