Task: Program Execution
Input (English): 4, 21, ['U', '5901', '8889', 'Z', 'g', 't', 'H', 'D', '9679', '9035', 'D', '4271', '6981', 'x', 'G', '447', 'T', 'x', '5093', '7675', '3027', '7223', '1399', 't', 'J', '8923', 'E', 'i', '6565']
Output (English): 720357673905xT744Gx18961724D53099769DHtgZ