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: ['Z', '1261', '4939', '3051', 'f', 'M', '3715', '6519', '9773', 'W', '6701', '693', '2803', '8909', '4897', 'K', '6823', '9961', '4163', 'j', '5681', '5897', '3443', 'G', 'g', '5531', '9655', 'a', '7413', '8113', '9141', '9545', 'f', '9279', '4659', 'K', '267', 'u', 'c']

26, 1261, 4939, 3051, 6, 13, 3715, 6519, 9773, 23, 6701, 693, 2803, 8909, 4897, 11, 6823, 9961, 4163, 10, 5681, 5897, 3443, 7, 7, 5531, 9655, 1, 7413, 8113, 9141, 9545, 6, 9279, 4659, 11, 267, 21, 3