In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: wnIFoRQvMMKMAqpCQYncuWUTJs, bPMUKKxYRxQvMMKMAqpCmzAPPMD

A: QvMMKMAqpC
****
Q: OYERnjubLFovtcS, FngzQJVGERnjubLFafmzq

A: ERnjubLF
****
Q: KVUizqVpuiaBrVe, VGXqVpuiaBpF

A:
qVpuiaB
****