You are given a code:

def main_solution(x):
    return func_20(('ldrxd' + x), func_13('nfxxup', '-'))

Can you predict the output of `main_solution("fyepxwocmu")` 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": "fyepxwocmu"}, "ref_output": "lnd-rfx-dxf-yxe-pux-wpocmu", "ref_code": "def main_solution(x):\n    return func_20(('ldrxd' + x), func_13('nfxxup', '-'))", "funcname": "main_solution"}
rule