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: ['t', '4969', 'y', '5627', '9855', '6967', '4147', 'k', 'M', 'D', 'O', 'd', 'l', '3499', '9979', '4235', '1115']

20, 4969, 25, 5627, 9855, 6967, 4147, 11, 13, 4, 15, 4, 12, 3499, 9979, 4235, 1115