You are given a code:

def main_solution(x):
    return (func_15('ffw') + func_13('psfg', '_'))

Can you predict the output of `main_solution("jpovr")` 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": "jpovr"}, "ref_output": "\u00abf\u00bb\u00abf\u00bb\u00abw\u00bbp_s_f_g", "ref_code": "def main_solution(x):\n    return (func_15('ffw') + func_13('psfg', '_'))", "funcname": "main_solution"}
rule