You are given a code:

def main_solution(x):
    return ('zqty' + 'zvj')

Can you predict the output of `main_solution("ehjsxz")` 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": "ehjsxz"}, "ref_output": "zqtyzvj", "ref_code": "def main_solution(x):\n    return ('zqty' + 'zvj')", "funcname": "main_solution"}
rule