You are given a code:

def main_solution(x):
    return func_20(func_13(x, '_'), func_11('sqtpb', 5))

Can you predict the output of `main_solution("qnielo")` 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": "qnielo"}, "ref_output": "qx_vny_uig_e_l_o", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '_'), func_11('sqtpb', 5))", "funcname": "main_solution"}
rule