You are given a code:

def main_solution(x):
    return func_20(('mfqfxk' + 'rpj'), func_15(x))

Can you predict the output of `main_solution("jskxt")` 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": "jskxt"}, "ref_output": "m\u00abfjq\u00bbf\u00abxsk\u00bbr\u00abpkj\u00bb\u00abx\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('mfqfxk' + 'rpj'), func_15(x))", "funcname": "main_solution"}
rule