Task: Program Execution
Input (English): 17, 21, ['173', 'u', '4103', 'g', 'U', '7753', 'H', '5271', 'T', '9339', 'r', 'U', '7277', '1555', '7647', '2063', 'U', 'P', '409', '3777', '1605', 'L', 'o', '7659', '1819', 'f', '9129', 'x', 'l']
Output (English): 16053777409PU