Task: Program Execution
Input (English): 3, 18, ['4701', 'd', 'r', 'Y', 'v', 'U', '2687', '4061', '5937', '9181', '4375', '8567', '5751', 'U', 'X', 'a', 'E', '3105', '7251', '7303']
Output (English): rYvU2687406159379181437585675751UXaE3105