You are given a code:

def main_solution(x):
    return func_20(('nphxm').swapcase(), func_15('jafy'))

Can you predict the output of `main_solution("yhvhqn")` 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": "yhvhqn"}, "ref_output": "N\u00abPjH\u00bbX\u00abMa\u00bb\u00abf\u00bb\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('nphxm').swapcase(), func_15('jafy'))", "funcname": "main_solution"}
rule