Task: Program Execution
Input (English): 13, 14, ['U', '2071', 'r', 'r', '2955', 'n', '7177', 'p', '3131', 'E', '4035', '263', 'c', '3407', 'E', 'j', 'K', 'C', 'b', '7409']
Output (English): c3407