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: ['7249', 'u', '4679', '2665', '1159']

7249, 21, 4679, 2665, 1159