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: ['R', 'm', '2629', '8095', '6637', '1021', '2529', 'g', 'o', '4655', '2299', '783', 'i', 'W', '5669', '5747', 'o', '519', 'S', '7347', 'i', '3545', '5303', '5409', 'F', 'b', '5965', 'o']

18, 13, 2629, 8095, 6637, 1021, 2529, 7, 15, 4655, 2299, 783, 9, 23, 5669, 5747, 15, 519, 19, 7347, 9, 3545, 5303, 5409, 6, 2, 5965, 15