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: ['7381', 'a', '5749', 'e', 'M', 's', 'l', '87', '4611', '7181', '6087', '633', '7461', 'O', '4873', 'K', 'P', 'V', 'c']

7381, 1, 5749, 5, 13, 19, 12, 87, 4611, 7181, 6087, 633, 7461, 15, 4873, 11, 16, 22, 3