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: ['P', 'c', 'P', 'v', '5131', 'J', 'd', 'i', 'u', 'b', '4933', '1281', 'A', 'g', '4263', 'o', '1817', '6163', '4521', '5973', '7735', 't', '7583', '3347', 'H', '2663', '2701', 'v', '8985', '5139']

16, 3, 16, 22, 5131, 10, 4, 9, 21, 2, 4933, 1281, 1, 7, 4263, 15, 1817, 6163, 4521, 5973, 7735, 20, 7583, 3347, 8, 2663, 2701, 22, 8985, 5139