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: ['I', 'B', 'J', '6055', 'p', 'l', 'B', 'd', '4253', 'U', '967', 'x', 'U', '8187', '833', 'l', '6751', '6625', 'z', '7921', 'u', '9099', '8961', '5777', 'H', '6433', '5033', '7217', 't', 'K', '9445', 'M', 'D', '2903', 'O', '4565', 'U', 'c', '2477']

9, 2, 10, 6055, 16, 12, 2, 4, 4253, 21, 967, 24, 21, 8187, 833, 12, 6751, 6625, 26, 7921, 21, 9099, 8961, 5777, 8, 6433, 5033, 7217, 20, 11, 9445, 13, 4, 2903, 15, 4565, 21, 3, 2477