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: ['r', '7955', '6927', 'P', '7203', 'A', '5145', 'D', 'i', 'G', '9261', 'v', 'W', '7291', '6855', '9719', '3251', 'D', '7463', '8865', '5611']

18, 7955, 6927, 16, 7203, 1, 5145, 4, 9, 7, 9261, 22, 23, 7291, 6855, 9719, 3251, 4, 7463, 8865, 5611