You are given a code:

def main_solution(x):
    return func_20(func_15('nekveo'), func_13('lnwknd', '_'))

Can you predict the output of `main_solution("ovsvosym")` 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": "ovsvosym"}, "ref_output": "\u00abln_\u00bbn\u00ab_ew\u00bb_\u00abkk_\u00bbn\u00ab_vd\u00bb\u00abe\u00bb\u00abo\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('nekveo'), func_13('lnwknd', '_'))", "funcname": "main_solution"}
rule