TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: cfvqbAUpWEmhCSFaUvGrYVNGeUiRP, hAxWMEmhCSFaUvGLBLmdTxhy

SOLUTION: EmhCSFaUvG

PROBLEM: tmBlKUto, eFDBlKLy

SOLUTION: BlK

PROBLEM: xCXWIeqIhjDiHivlRbmqV, BAAyKVIeqIhjDiHiVkJ

SOLUTION:
IeqIhjDiHi