You are given a code:

def main_solution(x):
    return func_5(func_5('mgp', 'ky'), 'wglr')

Can you predict the output of `main_solution("abtmfzff")` 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": "abtmfzff"}, "ref_output": "wglrkymgp", "ref_code": "def main_solution(x):\n    return func_5(func_5('mgp', 'ky'), 'wglr')", "funcname": "main_solution"}
rule