Task: Program Execution
Input (English): 9, 21, ['7903', '9553', 'J', '3439', '6709', '8539', 'Z', 'B', 'B', '455', '5417', 'Q', 'n', 'R', 'k', '639', '6371', 'K', 't', 'W', 'h', '6315']
Output (English): B4555417QnRk6396371KtWh