In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: ksRxEVrz, cOMRxEViwF

Answer: RxEV


Question: kWnjCoVmCSVuW, RILPKCoVmCSVbaOza

Answer: CoVmCSV


Question: UEroLcIhaIgxCdHRS, yTKKsIhaIgxCjbvOdR

Answer:
IhaIgxC