In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: QRPOwtZATjDoJDdRNNSOH, wiafFMwpAjDoJDdRNNuCDZ

A: jDoJDdRNN
****
Q: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT

A: joSidWiv
****
Q: AxAmDG, LTAmEV

A:
Am
****