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: ['B', '5881', 'p', '2287', 'n', '5341', 'Z', 'g', '4199', 'r', '759', 'u', '95', 'H', 'M', '6761', '1721', 'h', 'W', '1967', '6637', 'v', '7787', 'j']

2, 5881, 16, 2287, 14, 5341, 26, 7, 4199, 18, 759, 21, 95, 8, 13, 6761, 1721, 8, 23, 1967, 6637, 22, 7787, 10