You are given a code:

def main_solution(x):
    return func_20(func_15('yjvth'), (x + 'utr'))

Can you predict the output of `main_solution("oiyesbcv")` 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": "oiyesbcv"}, "ref_output": "\u00aboyi\u00bby\u00abejs\u00bbb\u00abcvv\u00bbu\u00abttr\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('yjvth'), (x + 'utr'))", "funcname": "main_solution"}
rule