You are given a code:

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

Can you predict the output of `main_solution("ieauukf")` 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": "ieauukf"}, "ref_output": "i-e-e-i-a-v-u-a-u-z-k-b-f", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'eivazb'), '-')", "funcname": "main_solution"}
rule