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: ['u', 'i', 'l', 'p', '7463', 'R', '2161', 'N', 'u', '6427', 'V', '8073', '7299', '4171', '9911', '9277', 'Z', '5165', 'H', '7665', 'F', '2113', '3559', 'c', '8931']

21, 9, 12, 16, 7463, 18, 2161, 14, 21, 6427, 22, 8073, 7299, 4171, 9911, 9277, 26, 5165, 8, 7665, 6, 2113, 3559, 3, 8931