You are given a code:

def main_solution(x):
    return func_20((x + 'dkr'), func_15('jnfw'))

Can you predict the output of `main_solution("qlsnijv")` 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": "qlsnijv"}, "ref_output": "q\u00abljs\u00bbn\u00abinj\u00bbv\u00abdfk\u00bbr\u00abw\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'dkr'), func_15('jnfw'))", "funcname": "main_solution"}
rule