instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC
answer:
PZYoKUoQn


question:
VRamNL, mUamIB
answer:
am


question:
IlPfmCAbIyVZNBd, JjqNTafmCAbIyVZNxvXLOBDbF
answer:

fmCAbIyVZN