Task: Program Execution
Input (English): 4, ['3971', 'Z', '8007', '9613', '4425', '8709', 'X', '3171', 'x', '755', 'p', '6649', '3291', 'C', '3161']
Output (English): 4425, 8709, X, 3171, x, 755, p, 6649, 3291, C, 3161