TASK 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.
PROBLEM: ['7763', '493', 'Y', '1371']

SOLUTION: 7763, 493, 25, 1371

PROBLEM: ['5671', 'O', 'r', '2473', '9907', '9515', '9817', 'E', '5479', 'G', '6493', '7015']

SOLUTION: 5671, 15, 18, 2473, 9907, 9515, 9817, 5, 5479, 7, 6493, 7015

PROBLEM: ['t', 'z', '9635', '9159', '9089', '5765']

SOLUTION:
20, 26, 9635, 9159, 9089, 5765