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

SOLUTION: HoDOYx

PROBLEM: lrBJDRkT, jmBJDrI

SOLUTION: BJD

PROBLEM: tSnLuglBybLeniiTrdAYE, lSxSoSlBybLeniiRZIHz

SOLUTION:
lBybLenii