instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
sCMyALRSDknURKqZDlqFf, oEIfHyALRSDknUrnMebev
answer:
yALRSDknU


question:
SUgXyznbUQRpiLUTlRb, jlnwLTnbUQRpioUFyJ
answer:
nbUQRpi


question:
vvKJTgs, bMeKJTEXI
answer:

KJT