You are given a code:

def main_solution(x):
    return func_5(func_20('xxux', 'busng'), 'nlcw')

Can you predict the output of `main_solution("ymgp")` 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": "ymgp"}, "ref_output": "nlcwxbxuusxng", "ref_code": "def main_solution(x):\n    return func_5(func_20('xxux', 'busng'), 'nlcw')", "funcname": "main_solution"}
rule