Task: Program Execution
Input (English): 21, 24, ['X', '7149', 'v', '989', 'A', '9121', 'T', '8933', '1953', '9421', '5427', 'K', '7837', '9549', 'R', '5253', 'T', 'M', 's', 'x', 'U', '901', 'o', 'q']
Output (English): q, o, 901, U