You are given a code:

def main_solution(x):
    return (func_20('wpe', 'wkprc') + func_13('yfvnv', '_'))

Can you predict the output of `main_solution("qrmwxle")` 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": "qrmwxle"}, "ref_output": "wwpkeprcy_f_v_n_v", "ref_code": "def main_solution(x):\n    return (func_20('wpe', 'wkprc') + func_13('yfvnv', '_'))", "funcname": "main_solution"}
rule