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

SOLUTION: aECW

PROBLEM: oGaGjsaKsUpLQAg, iDGjsaKsUoYGuta

SOLUTION: GjsaKsU

PROBLEM: voXyjLwlfpkYEKqtPayR, KtyfSaXkfpkYEKqtPaGovYtxuZC

SOLUTION:
fpkYEKqtPa