You are given a code:

def main_solution(x):
    return func_13(func_20('tcqq', x), '-')

Can you predict the output of `main_solution("efao")` 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": "efao"}, "ref_output": "t-e-c-f-q-a-q-o", "ref_code": "def main_solution(x):\n    return func_13(func_20('tcqq', x), '-')", "funcname": "main_solution"}
rule