You are given a code:

def main_solution(x):
    return func_13(('hhrh' + 'slv'), '_')

Can you predict the output of `main_solution("qjipfos")` 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": "qjipfos"}, "ref_output": "h_h_r_h_s_l_v", "ref_code": "def main_solution(x):\n    return func_13(('hhrh' + 'slv'), '_')", "funcname": "main_solution"}
rule