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', '7037', 'n', '8121', '4611', '8897', '4247', 'u', 'w', 'a', 'N', '4153', '5099', '605', '4785', '8407', '6059', 'Q', '6395', '8267', 'S']

21, 7037, 14, 8121, 4611, 8897, 4247, 21, 23, 1, 14, 4153, 5099, 605, 4785, 8407, 6059, 17, 6395, 8267, 19