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

[Q]: uDaqoOpUtLDdTGTO, ncIgBjDPqoOpUtLDdTNtiEyarDO
[A]: qoOpUtLDdT


[Q]: WFAPUCgVYbmZiFlacUzyv, xQFiekrgPUCgVYbmZUEtl
[A]: PUCgVYbmZ


[Q]: DSrXIcPkF, gTeGrXIceP
[A]:
rXIc