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: ['5987', 'J', '1045', '3735', '5627', 'c', '8759', 'm', '8993', 'I', 'i', '7423', '6609', '4969', '3803', '419', 'z', '6115', '6457', '9927', 'U', 'v', 'C', '7703', '4563', '3655', '7705', '8535', 'L', 'I', 'X', 'v', 'i', 'h', 'V', 'b', '9921', '3487', 'g']

5987, 10, 1045, 3735, 5627, 3, 8759, 13, 8993, 9, 9, 7423, 6609, 4969, 3803, 419, 26, 6115, 6457, 9927, 21, 22, 3, 7703, 4563, 3655, 7705, 8535, 12, 9, 24, 22, 9, 8, 22, 2, 9921, 3487, 7