You are given a code:

def main_solution(x):
    return func_20(func_20(x, 'efkvz'), func_15('swiyts'))

Can you predict the output of `main_solution("dqlqhdr")` 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": "dqlqhdr"}, "ref_output": "d\u00abesq\u00bbf\u00ablwk\u00bbq\u00abvih\u00bbz\u00abdyr\u00bb\u00abt\u00bb\u00abs\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, 'efkvz'), func_15('swiyts'))", "funcname": "main_solution"}
rule