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: ['4511', '3187', 'A', '4469', '7071', 'd', '3401', '4495', 'D', 'O', '1637', 'X', '4547', '4637', 'S', 'D', '4555', '7091', 'N', '1603', 'n', 'O', '429', '6795', 'm', '8921', '5357', '101', '7671', '7121', '2667']

4511, 3187, 1, 4469, 7071, 4, 3401, 4495, 4, 15, 1637, 24, 4547, 4637, 19, 4, 4555, 7091, 14, 1603, 14, 15, 429, 6795, 13, 8921, 5357, 101, 7671, 7121, 2667