You are given a code:

def main_solution(x):
    return (('hpcy' + 'mtrov') + func_13('yaeygh', '_'))

Can you predict the output of `main_solution("jgfny")` 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": "jgfny"}, "ref_output": "hpcymtrovy_a_e_y_g_h", "ref_code": "def main_solution(x):\n    return (('hpcy' + 'mtrov') + func_13('yaeygh', '_'))", "funcname": "main_solution"}
rule