You are given a code:

def main_solution(x):
    return func_20(func_15(x), ('lwvpez' + 'zpho'))

Can you predict the output of `main_solution("nqspxt")` 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": "nqspxt"}, "ref_output": "\u00ablnw\u00bbv\u00abpqe\u00bbz\u00abzsp\u00bbh\u00abop\u00bb\u00abx\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('lwvpez' + 'zpho'))", "funcname": "main_solution"}
rule