You are given a code:

def main_solution(x):
    return (func_3('kcijc') + func_13('offf', '_'))

Can you predict the output of `main_solution("rykouldegy")` 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": "rykouldegy"}, "ref_output": "ccijko_f_f_f", "ref_code": "def main_solution(x):\n    return (func_3('kcijc') + func_13('offf', '_'))", "funcname": "main_solution"}
rule