instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
rRmkmETbjzCzZZxihrVdefxfcenJ, ogQtzAgWjKCzZZxihrVdRswMCmngp
answer:
CzZZxihrVd


question:
BTvLVMYp, mjOvLVMqYo
answer:
vLVM


question:
hTqPxA, tMqPTD
answer:

qP