You are given a code:

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

Can you predict the output of `main_solution("dspqqcf")` 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": "dspqqcf"}, "ref_output": "d\u00absbp\u00bbq\u00abqpc\u00bbf\u00abdqs\u00bbp\u00abqxq\u00bbcfdspqqcfdspqqcf", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 4), func_15('bpqx'))", "funcname": "main_solution"}
rule