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

SOLUTION: jsASFf

PROBLEM: mjCEUoPmeKbvCgUtUL, SrHtrPmeKbvYpQAVp

SOLUTION: PmeKbv

PROBLEM: xdIEfOODDKtBzuYDkfyBsFnb, HYvzutZgZODDKtBzuYDljrGCF

SOLUTION:
ODDKtBzuYD