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: ['6893', '5141', '5573', 'h', 'u', 'p', '8533', 'I', '9015', 'h', 'R', 'v', 'X', '5313', 'r', '9863', '3743', 'E', 'e', 't', '5397', 'E', 'P', '6921', 'Z', 'U', 't', '1487', '9659', '7547', 'e', '6595', 'p', 'h', 'r']

6893, 5141, 5573, 8, 21, 16, 8533, 9, 9015, 8, 18, 22, 24, 5313, 18, 9863, 3743, 5, 5, 20, 5397, 5, 16, 6921, 26, 21, 20, 1487, 9659, 7547, 5, 6595, 16, 8, 18