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

SOLUTION: ddewrN

PROBLEM: VTwtMVKmrRvL, WLoVtWtMVKmrDCke

SOLUTION: tMVKmr

PROBLEM: BiWgapYVhBybKgr, xhlnjpYVhBlDVPU

SOLUTION:
pYVhB