Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['2751', '4053', 'u', 'e', 'g', '5901', 'l', 'r', 'N', '8445', '7433', '1067', '2989', '1783', 'Q', 'R', '4305', '1231', '3239', 'j', 'G', 'G', '1291', 'A', '6139', 'Z', '1501', 'J']

2751, 4053, 21, 5, 7, 5901, 12, 18, 14, 8445, 7433, 1067, 2989, 1783, 17, 18, 4305, 1231, 3239, 10, 7, 7, 1291, 1, 6139, 26, 1501, 10