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

SOLUTION: Dp

PROBLEM: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL

SOLUTION: HMpUYADGfE

PROBLEM: bgbLLW, cJbLOq

SOLUTION:
bL