You are given a code:

def main_solution(x):
    return ('zjdx' + 'vxyohb')

Can you predict the output of `main_solution("yxr")` 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": "yxr"}, "ref_output": "zjdxvxyohb", "ref_code": "def main_solution(x):\n    return ('zjdx' + 'vxyohb')", "funcname": "main_solution"}
rule