Task: Program Execution
Input (English): 3, 7, ['8471', '1167', 'P', 'k', '6077', 'L', '4197', '9085', '3315', 'E', 'W', '9629', 'U', 'P', '8017', '1703', 'X', 'S', 'N', '4729', 'M', '1399', 'x', 'A']
Output (English): P, E, X, A