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: ['5471', '235', 'b', 'e', '7165', 'T', '9241', '3435', '2991', 'r', 'R', '4039', '4183', '5249', 'D', '2811', 'S', 'l', '5031', 'j', '4721', '1485', '7969', 'c', '7405', 'I', '1057', 'I', 'D', 'A', '4259', '8165', '3337', 'p', 'U', '2193', 'A']

5471, 235, 2, 5, 7165, 20, 9241, 3435, 2991, 18, 18, 4039, 4183, 5249, 4, 2811, 19, 12, 5031, 10, 4721, 1485, 7969, 3, 7405, 9, 1057, 9, 4, 1, 4259, 8165, 3337, 16, 21, 2193, 1