instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
uRLpAWCotLmxcSmKyvo, laotLmxcSmKyBwVfJB
answer:
otLmxcSmKy


question:
UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak
answer:
ThdYrGKM


question:
yJXQGEeSrDVTwH, BmHJEeSrDtnFF
answer:

EeSrD