You are given a code:

def main_solution(x):
    return func_20(x, 'txvzd')

Can you predict the output of `main_solution("ldqiyqz")` 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": "ldqiyqz"}, "ref_output": "ltdxqvizydqz", "ref_code": "def main_solution(x):\n    return func_20(x, 'txvzd')", "funcname": "main_solution"}
rule