You are given a code:

def main_solution(x):
    return func_5(func_20(x, 'tqfe'), 'gdh')

Can you predict the output of `main_solution("vqvrpiwi")` 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": "vqvrpiwi"}, "ref_output": "gdhvtqqvfrepiwi", "ref_code": "def main_solution(x):\n    return func_5(func_20(x, 'tqfe'), 'gdh')", "funcname": "main_solution"}
rule