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: ['2291', '881', '8797', 'Z', '9231', '4719', 'W', '2937', '4567', '2871', 'f', 'x', 'K', '7929', '4281', 'v', 'v', '8947', '2607', 'z', '159', 'R', 'H', 'p', 's', 'D', '1621', 'T', 'K', '7977', 'l', 'a', '8413', '5937', 'U', '6541']

2291, 881, 8797, 26, 9231, 4719, 23, 2937, 4567, 2871, 6, 24, 11, 7929, 4281, 22, 22, 8947, 2607, 26, 159, 18, 8, 16, 19, 4, 1621, 20, 11, 7977, 12, 1, 8413, 5937, 21, 6541