instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX
answer:
hzGsanfsa


question:
ICizmXnKMpUH, oDrnmXnKgWXX
answer:
mXnK


question:
TGcVNWFmsQRQVulYCJJfT, YowwIfRKmsQRQVulwfl
answer:

msQRQVul