instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
wnIFoRQvMMKMAqpCQYncuWUTJs, bPMUKKxYRxQvMMKMAqpCmzAPPMD
answer:
QvMMKMAqpC

question:
oHoJrr, YAoJSq
answer:
oJ

question:
nFlCkEdsSs, hODrlCkEiPOg
answer:
lCkE