You are given a code:

def main_solution(x):
    return func_5(func_4('kudrj'), 'dlrp')

Can you predict the output of `main_solution("ybcv")` 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": "ybcv"}, "ref_output": "dlrpkudrj", "ref_code": "def main_solution(x):\n    return func_5(func_4('kudrj'), 'dlrp')", "funcname": "main_solution"}
rule