Task: Program Execution
Input (English): 7, 18, ['U', 'V', '9429', 'U', 'Z', '1439', '6363', '2175', '8759', '3727', '5931', 'l', '7795', 'F', 'H', 'B', '3571', 'f']
Output (English): f1753BHF5977l13957273957857123636