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', '5981', 'N', '4135', 'o', '1141', '8637', 'g', '8317', '8227', '269', '5637', '6669', 'j', '8529', 'n', 'D', 'p', '1787', 'i', '1355', '4735', '2483', '1565', '6331', 'P', '4417', 'W', 'C', 'K', 'S', 'K', 'h', 'S', '6827', '8237', '7791', '7095']

18, 5981, 14, 4135, 15, 1141, 8637, 7, 8317, 8227, 269, 5637, 6669, 10, 8529, 14, 4, 16, 1787, 9, 1355, 4735, 2483, 1565, 6331, 16, 4417, 23, 3, 11, 19, 11, 8, 19, 6827, 8237, 7791, 7095