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: ['1749', 'U', '2249', 'C', '3911', '5909', '421', '7017', 'x', '7129', '1751', '2221', 'K', '4205', '2393', '4297', 'q', '1459', '4599', '6133', 'r', '6037', 'V', 't', '4677', '7483', '1491', 'd', 's', '4033', '4693', '559', 'Z', '563', 'V', 'J', 'E', '2057', '5161']

1749, 21, 2249, 3, 3911, 5909, 421, 7017, 24, 7129, 1751, 2221, 11, 4205, 2393, 4297, 17, 1459, 4599, 6133, 18, 6037, 22, 20, 4677, 7483, 1491, 4, 19, 4033, 4693, 559, 26, 563, 22, 10, 5, 2057, 5161