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: ['C', '5535', 'l', 'z', '4317', '5023', 'G', 'p', 'g', '6067', 'Y', '5405', '8191', 'h', '6059', '9665', '407', 'f', '5129', '3293', 'O', 'h', 'd', '985', 'u', 'L', '593', 'r', 'f', 'a', '9931', 'H', 'p', '3781', '7237', '59', '6401']

3, 5535, 12, 26, 4317, 5023, 7, 16, 7, 6067, 25, 5405, 8191, 8, 6059, 9665, 407, 6, 5129, 3293, 15, 8, 4, 985, 21, 12, 593, 18, 6, 1, 9931, 8, 16, 3781, 7237, 59, 6401