You are given a code:

def main_solution(x):
    return func_20(func_19(x, 1), func_15('ruj'))

Can you predict the output of `main_solution("iwyipouvtk")` 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": "iwyipouvtk"}, "ref_output": "w\u00abyri\u00bbp\u00abouu\u00bbv\u00abtjk\u00bbi", "ref_code": "def main_solution(x):\n    return func_20(func_19(x, 1), func_15('ruj'))", "funcname": "main_solution"}
rule