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

SOLUTION: YK

PROBLEM: FCKbAgSVgj, wAEAWbAgSVSVwD

SOLUTION: bAgSV

PROBLEM: eeXYrtjsEqFWSP, rzcKertjsEqOMDhmZ

SOLUTION:
rtjsEq

