Task: Program Execution
Input (English): 7, ['U', 'U', 'X', '1963', 'X', '7597', '3719', '5435', '2453', 'W', '8411', '649', '2193', '2803', '8171', '3445']
Output (English): U, U, X, 1963, X, 7597, 3719, 5435, 2453