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

SOLUTION: IsQRtUlPg

PROBLEM: yywhNdZQkLSzbOvhluicHA, lfZQkLSzbOvhVC

SOLUTION: ZQkLSzbOvh

PROBLEM: ViTpCkaPytngI, CQBpCkaPrSI

SOLUTION:
pCkaP