You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_19('dlliku', 3))

Can you predict the output of `main_solution("eqtvsrc")` 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": "eqtvsrc"}, "ref_output": "\u00abiek\u00bbu\u00abdql\u00bbl\u00abt\u00bb\u00abv\u00bb\u00abs\u00bb\u00abr\u00bb\u00abc\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_19('dlliku', 3))", "funcname": "main_solution"}
rule