TASK 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.
PROBLEM: ['u', 'n', '2763', 'n', '5869', 'w', '4847', '4369', '8245', '9801', 'W', '7991', 't', '9233', 'Z', '3521', 'Z', 'H', 'N', 'a', '9811', '5705', '6637', '5067', 'o']

SOLUTION: 21, 14, 2763, 14, 5869, 23, 4847, 4369, 8245, 9801, 23, 7991, 20, 9233, 26, 3521, 26, 8, 14, 1, 9811, 5705, 6637, 5067, 15

PROBLEM: ['151', '2843', '8041', 'k', '1601', '9465', 'i', 'u', '7427', '7695', '1457', 'Z', 's', 'k', '6993', '1415', '9321', 'v', '2303', 'v', '735', '4629', 'R', '2353', 'd', 'j', 'T', '1177', 'f', 'p', 'w', 'w', 'l', 'M', '7423']

SOLUTION: 151, 2843, 8041, 11, 1601, 9465, 9, 21, 7427, 7695, 1457, 26, 19, 11, 6993, 1415, 9321, 22, 2303, 22, 735, 4629, 18, 2353, 4, 10, 20, 1177, 6, 16, 23, 23, 12, 13, 7423

PROBLEM: ['l', '2149', '3321', 'E', 'h', '7869', 'd', 'U', 'N', '8219', '6831', '1775', '4365', '9199', 'x', 'A', '2585', '6907', 'S', 'E', 'V', '197']

SOLUTION:
12, 2149, 3321, 5, 8, 7869, 4, 21, 14, 8219, 6831, 1775, 4365, 9199, 24, 1, 2585, 6907, 19, 5, 22, 197