Task: Program Execution
Input (English): 10, 21, ['2631', '1899', 'W', '1377', 'P', '8069', 'h', 'x', '9563', '3029', '3971', '7629', 'u', '5827', 't', 'e', 'i', '9473', 'O', '6407', 'j']
Output (English): 302939717629u5827tei9473O6407j