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

Q: zqRbqwgmqGIAGTeeoGFOSr, RFnLqwgmqGIAGLcEvAWxY

A: qwgmqGIAG
****
Q: UmYbssMbmsXkKQuzNasLOib, EMqlbmsXkKQuzNcyHrpZXOQW

A: bmsXkKQuzN
****
Q: xLrhjmLkERuDwEWXc, bxpPrhjmLkERuPpylDxH

A:
rhjmLkERu
****