Task: Program Execution
Input (English): 2, 15, ['7973', 'x', '6363', 'h', 'D', '4113', '2093', 'U', 'd', 'T', '7469', '3635', '5271', 'D', '1705', 'U', 'h', 'u']
Output (English): 5071D172553639647TdU39023114Dh3636x