You are given a code:

def main_solution(x):
    return ('wapb' + 'iulmx')

Can you predict the output of `main_solution("iamtwnoyqd")` 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": "iamtwnoyqd"}, "ref_output": "wapbiulmx", "ref_code": "def main_solution(x):\n    return ('wapb' + 'iulmx')", "funcname": "main_solution"}
rule