You are given a code:

def main_solution(x):
    return (('qqjvez' + 'uuprcm') + func_5('nmi', 'trkm'))

Can you predict the output of `main_solution("optjdai")` 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": "optjdai"}, "ref_output": "qqjvezuuprcmtrkmnmi", "ref_code": "def main_solution(x):\n    return (('qqjvez' + 'uuprcm') + func_5('nmi', 'trkm'))", "funcname": "main_solution"}
rule