You are given a code:

def main_solution(x):
    return ('twgjf' + 'sxvmnx')

Can you predict the output of `main_solution("mxfecc")` 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": "mxfecc"}, "ref_output": "twgjfsxvmnx", "ref_code": "def main_solution(x):\n    return ('twgjf' + 'sxvmnx')", "funcname": "main_solution"}
rule