You are given a code:

def main_solution(x):
    return ('inwwvk' + 'tfhvls')

Can you predict the output of `main_solution("uwateu")` 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": "uwateu"}, "ref_output": "inwwvktfhvls", "ref_code": "def main_solution(x):\n    return ('inwwvk' + 'tfhvls')", "funcname": "main_solution"}
rule