Task: Program Execution
Input (English): 11, 12, ['6217', 'E', '7519', 'B', 'M', '8641', '9909', 'p', 'w', 'q', 'f', 'E', 'W', 'q', 'E', 'k', 'I', '3783', 'R', '6811']
Output (English): Ef