You are given a code:

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

Can you predict the output of `main_solution("fppfa")` 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": "fppfa"}, "ref_output": "\u00abe\u00bb\u00abm\u00bb\u00abt\u00bb\u00abw\u00bb\u00aba\u00bb\u00abg\u00bbftpapmfha", "ref_code": "def main_solution(x):\n    return (func_15('emtwag') + func_20(x, 'tamh'))", "funcname": "main_solution"}
rule