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: ['R', '1615', 'I', 'k', '3675', 'h', 'l', '7711', 'W', 'j', '9325', 'L', '8603', '915', 'H', '615', 'n', '443', '1457', 'V', 't', 'z', '9431', '7423', 'S', 'b', '3555', '8547', '6749', '5879', 'V']

18, 1615, 9, 11, 3675, 8, 12, 7711, 23, 10, 9325, 12, 8603, 915, 8, 615, 14, 443, 1457, 22, 20, 26, 9431, 7423, 19, 2, 3555, 8547, 6749, 5879, 22