Task: Program Execution
Input (English): 7, ['6303', 'h', '3557', 'U', 'G', '9575', 'x', '6007', '459', 'K', 'E', 'A', '3449', 's', 'X', '3565', '3147', 'U', '6811', '9451', 'M']
Output (English): 6303, 6007, X