You are given a code:

def main_solution(x):
    return (func_11('lhrkrt', 1) + func_20('kznpp', 'wumf'))

Can you predict the output of `main_solution("vula")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "vula"}, "ref_output": "mislsukwzunmpfp", "ref_code": "def main_solution(x):\n    return (func_11('lhrkrt', 1) + func_20('kznpp', 'wumf'))", "funcname": "main_solution"}
rule