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: ['7783', '2217', 'z', 'u', '6021', 'H', 'V', '7421', 'k', '9535', 'm', 'V', 'm', '1803', '7699', 'f', 'q', 'N', 'I', 'D', 'p', 'j', 'A', '533', '7813', '719', '6235', 'v', 'm', '287', '4619', '9171', '9353', '7961', 'l', 'R', '5155', 'k', '1923']

7783, 2217, 26, 21, 6021, 8, 22, 7421, 11, 9535, 13, 22, 13, 1803, 7699, 6, 17, 14, 9, 4, 16, 10, 1, 533, 7813, 719, 6235, 22, 13, 287, 4619, 9171, 9353, 7961, 12, 18, 5155, 11, 1923