You are given a code:

def main_solution(x):
    return func_13(func_20(x, 'mpd'), '|')

Can you predict the output of `main_solution("qlessvou")` 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": "qlessvou"}, "ref_output": "q|m|l|p|e|d|s|s|v|o|u", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'mpd'), '|')", "funcname": "main_solution"}
rule