You are given a code:

def main_solution(x):
    return func_5(func_20('vxfyyu', 'doywch'), 'bjrb')

Can you predict the output of `main_solution("mwghlh")` 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": "mwghlh"}, "ref_output": "bjrbvdxofyywycuh", "ref_code": "def main_solution(x):\n    return func_5(func_20('vxfyyu', 'doywch'), 'bjrb')", "funcname": "main_solution"}
rule