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

jXqEDHTCxTiUAICWZJdpmYq, GBTCxTiUAICZKnLgZBXi
TCxTiUAIC

zgJGhxLU, EwJGhedW
JGh

cpiCdZOyHDpHKwzoTln, rJqKCdZOyHDpHIspcTmV

CdZOyHDpH