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: ['7151', 'C', 'B', 'p', '3569', '6991', 'u', 'y', '1851', 'U', 'h', '7985', '1117', 'D', 'P', 'E', '8301', 'z', '1637', 'Z', 'p', '8519', '4187', '5007', 'g']

7151, 3, 2, 16, 3569, 6991, 21, 25, 1851, 21, 8, 7985, 1117, 4, 16, 5, 8301, 26, 1637, 26, 16, 8519, 4187, 5007, 7