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

SOLUTION: DtWLln

PROBLEM: SyweIt, ILweip

SOLUTION: we

PROBLEM: WkRHGwJfiOmdL, ICyVLYBRHGwJfiOmVBpODCxdS

SOLUTION:
RHGwJfiOm