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: ['6341', 'E', 'U', 'M', '6643', '1267', 'w', '4065', '9143', 't', 'G', '6187', '5067', '1851', '4779', '7345', 'j', '7173', '5449', '515', '2915', '1841', 'P', '6841', 'L', '8065', '8985', '5567', '7567', 'T', 'f', '827', '6811']

6341, 5, 21, 13, 6643, 1267, 23, 4065, 9143, 20, 7, 6187, 5067, 1851, 4779, 7345, 10, 7173, 5449, 515, 2915, 1841, 16, 6841, 12, 8065, 8985, 5567, 7567, 20, 6, 827, 6811