You are given a code:

def main_solution(x):
    return func_20(func_15('qgkrg'), func_1('lshv', 4))

Can you predict the output of `main_solution("nfjnrqqc")` 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": "nfjnrqqc"}, "ref_output": "\u00ablqs\u00bbh\u00abvgl\u00bbs\u00abhkv\u00bbl\u00absrh\u00bbv\u00ablgs\u00bbhv", "ref_code": "def main_solution(x):\n    return func_20(func_15('qgkrg'), func_1('lshv', 4))", "funcname": "main_solution"}
rule