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: ['3739', 'd', '6025', '8489', '4545', '2441', 'Z', '3975', 'C', 'x', 'P', 'G', '1163', '2431', '405', '765', '8889', '9767', '6759', '7785', 'A', '6701', '5301', '7947', '4199', '6221', '781', 's', 'o', 'x', 'J', 'X', '7305', 'W', 'i', '4299', '7911', 'U']

3739, 4, 6025, 8489, 4545, 2441, 26, 3975, 3, 24, 16, 7, 1163, 2431, 405, 765, 8889, 9767, 6759, 7785, 1, 6701, 5301, 7947, 4199, 6221, 781, 19, 15, 24, 10, 24, 7305, 23, 9, 4299, 7911, 21