Task: Program Execution
Input (English): 1, 15, ['3953', '613', 'M', '9629', '8949', '8679', 'U', '4393', '3693', '575', 'k', '5327', '6853', 'X', '13', 'd', '3411', '9493', '6621', 'y', 'J', 'm', 'O', '4083', 'Q']
Output (English): 31X35867235k57539633934U976894989269M3163593