You are given a code:

def main_solution(x):
    return ('ksbpe' + 'zfydk')

Can you predict the output of `main_solution("ctrqxbpp")` 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": "ctrqxbpp"}, "ref_output": "ksbpezfydk", "ref_code": "def main_solution(x):\n    return ('ksbpe' + 'zfydk')", "funcname": "main_solution"}
rule