instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
GnElFKBIoYmAdvz, GrElFKBIoMo
answer:
ElFKBIo


question:
CCzKRbuEAmN, qTLzKRbuhEqq
answer:
zKRbu


question:
ohueEOjHvAuoFVmMFft, ovdJPqOjHvAuoFVGbvxzlnE
answer:

OjHvAuoFV