instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
gwVLygvd, VOQLyglfo
answer:
Lyg


question:
jyJrDIhxJtWbnooEXZ, uyXifNCIhxJtWbnVCUrt
answer:
IhxJtWbn


question:
cXMiWJ, lFMiCM
answer:

Mi