instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
cCDTMXjGMNikONun, jpcMXjGMNizBEWQzT
answer:
MXjGMNi


question:
cfvqbAUpWEmhCSFaUvGrYVNGeUiRP, hAxWMEmhCSFaUvGLBLmdTxhy
answer:
EmhCSFaUvG


question:
HyKwSlqSkEoTmHmlSD, PQWHoRnwSlqSkEoTPpZo
answer:

wSlqSkEoT