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: ['5763', '557', 'L', 'f', 'H', 'd', '6571', 'Y', 'C', 'b', '5783', '1817', 'a', 'm', 'x', 'g', '8115', 'D', 'Z', 't', '3005', '4077', '9255', '1267', 'G', 'v', 'c', 'd', 'F', '9845', 'o', '1155']

5763, 557, 12, 6, 8, 4, 6571, 25, 3, 2, 5783, 1817, 1, 13, 24, 7, 8115, 4, 26, 20, 3005, 4077, 9255, 1267, 7, 22, 3, 4, 6, 9845, 15, 1155