You are given a code:

def main_solution(x):
    return (func_13('aemf', '_') + func_13('zgkp', '_'))

Can you predict the output of `main_solution("cfawflqe")` 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": "cfawflqe"}, "ref_output": "a_e_m_fz_g_k_p", "ref_code": "def main_solution(x):\n    return (func_13('aemf', '_') + func_13('zgkp', '_'))", "funcname": "main_solution"}
rule