TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx

SOLUTION: ffTbIbBrcH

PROBLEM: SyweIt, ILweip

SOLUTION: we

PROBLEM: LpQnTPKG, zdQnTPwtEa

SOLUTION:
QnTP