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

Q: YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx

A: ffTbIbBrcH
****
Q: QeNePjbLBKbDOuAVTJtXL, xjPVOyPbLBKbDOuDsMSEF

A: bLBKbDOu
****
Q: fzSiCtCGEWnNT, ENkSiCtCGEWvYImBe

A:
SiCtCGEW
****