You are given a code:

def main_solution(x):
    return ('incf' + 'ips')

Can you predict the output of `main_solution("nzvzbw")` 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": "nzvzbw"}, "ref_output": "incfips", "ref_code": "def main_solution(x):\n    return ('incf' + 'ips')", "funcname": "main_solution"}
rule