You are given a code:

def main_solution(x):
    return ('gnd' + 'shp')

Can you predict the output of `main_solution("mlnzhgoxx")` 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": "mlnzhgoxx"}, "ref_output": "gndshp", "ref_code": "def main_solution(x):\n    return ('gnd' + 'shp')", "funcname": "main_solution"}
rule