You are given a code:

def main_solution(x):
    return (func_20('gudjb', x) + ('rdso').capitalize())

Can you predict the output of `main_solution("mfeutas")` 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": "mfeutas"}, "ref_output": "gmufdejubtasRdso", "ref_code": "def main_solution(x):\n    return (func_20('gudjb', x) + ('rdso').capitalize())", "funcname": "main_solution"}
rule