Task: Program Execution
Input (English): 1, 13, ['6461', '1773', 'W', '1147', '7757', '8199', 'Z', 'I', '2793', '2245', '9945', 'W', 'd', '9039', 'm', '8019', '2815', '2499']
Output (English): dW549954223972IZ991875777411W37711646