You are given a code:

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

Can you predict the output of `main_solution("peufyj")` 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": "peufyj"}, "ref_output": "p\u00abetu\u00bbf\u00abyij\u00bbp\u00abeiu\u00bbf\u00abyuj\u00bb\u00aby\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + x), func_15('tiiuyu'))", "funcname": "main_solution"}
rule