You are given a code:

def main_solution(x):
    return ('pdkgk' + 'zhrhd')

Can you predict the output of `main_solution("gdpfdra")` 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": "gdpfdra"}, "ref_output": "pdkgkzhrhd", "ref_code": "def main_solution(x):\n    return ('pdkgk' + 'zhrhd')", "funcname": "main_solution"}
rule