In this task, you are given two lists A,B. Find the longest common subsequence in the lists A and B.
['t', 6969, 7619, 'V', 'O', 'l', '3685', 'U', 's', 'f', 'z', 'F', 'x', 'B', 7763, 7261, 'W', 473], [1045, 't', 'W', 'O', 6889, 'O', 'l', '3685', 'U', 's', 'f', 'z', 'F', 'x', 'p', 'C', 'T', 'q', 3141]