Task: Program Execution
Input (English): 4, 5, ['U', 'N', '8445', 'a', 'a', 'U', '2267', 'i', 'B', '3115', '2539', 'o', '7679', 'S', '1821', '9033', '9733', 'R', 'B', '1897', '4361', 'S', '7301', 'M', '7061']
Output (English): a, B, S, B, M