You are given a code:

def main_solution(x):
    return ('ikr' + 'wpnu')

Can you predict the output of `main_solution("kqiio")` 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": "kqiio"}, "ref_output": "ikrwpnu", "ref_code": "def main_solution(x):\n    return ('ikr' + 'wpnu')", "funcname": "main_solution"}
rule