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: ['m', '1959', 'E', '6535', '8291', '5409', '6657', '1021', 'n', '6221', '53', 'n', 'z', 'Q', '7623', 'H', '6101', 'V', '4011', '9843', 't', '1601', '6743', 'D', 'k', 'l', '9021', 'z', '9153', '1849', 'I', '9605', '1323', 'w', '8853', 'V', 'j', 'b', '4233']

13, 1959, 5, 6535, 8291, 5409, 6657, 1021, 14, 6221, 53, 14, 26, 17, 7623, 8, 6101, 22, 4011, 9843, 20, 1601, 6743, 4, 11, 12, 9021, 26, 9153, 1849, 9, 9605, 1323, 23, 8853, 22, 10, 2, 4233