instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ZyrpGdXvvtrKQIxU, CLNGdXvvtrKQDpicfqLdt
answer:
GdXvvtrKQ


question:
oKZCAErEMqzODnkcNqxVdoBOC, yHzRJuSqzODnkcNqxExr
answer:
qzODnkcNqx


question:
ujlyeBOVmMPSelFS, gDVwQWneBOVmMPfA
answer:

eBOVmMP