You are given a code:

def main_solution(x):
    return ('cfi' + 'ymyx')

Can you predict the output of `main_solution("ehtphuku")` 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": "ehtphuku"}, "ref_output": "cfiymyx", "ref_code": "def main_solution(x):\n    return ('cfi' + 'ymyx')", "funcname": "main_solution"}
rule