instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
RJMYumLAlhmnbhzKRzIOWsGrxGu, VEViqlihmnbhzKRzIBArjAhYrz
answer:
hmnbhzKRzI


question:
YRNpKFPGzUsgCOBJgbVG, TdEpMngFPGzUsgCOZykYRrLp
answer:
FPGzUsgCO


question:
cVCoKkwdObgYNryARLn, lAkWdzwdObgYNrytLc
answer:

wdObgYNry