You are given a code:

def main_solution(x):
    return ('uva' + 'eltno')

Can you predict the output of `main_solution("vhpnzcdhs")` 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": "vhpnzcdhs"}, "ref_output": "uvaeltno", "ref_code": "def main_solution(x):\n    return ('uva' + 'eltno')", "funcname": "main_solution"}
rule