You are given a code:

def main_solution(x):
    return func_5(func_13('wwo', '_'), 'qsh')

Can you predict the output of `main_solution("nxwltul")` 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": "nxwltul"}, "ref_output": "qshw_w_o", "ref_code": "def main_solution(x):\n    return func_5(func_13('wwo', '_'), 'qsh')", "funcname": "main_solution"}
rule