In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Input: Consider Input: KvPFobZEGs, eKFobZEtnm

Output: FobZE


Input: Consider Input: sOSXbnluNuvwMETKda, JzXbnluNuvyeVHO

Output: XbnluNuv


Input: Consider Input: lvDYAnHNDCaLyjYvT, nFngYAnHNDCfaBwm


Output: YAnHNDC