You are given a code:

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

Can you predict the output of `main_solution("tdrom")` 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": "tdrom"}, "ref_output": "t\u00abdfr\u00bbo\u00abmak\u00bbw\u00ablrb\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'kwlb'), func_15('far'))", "funcname": "main_solution"}
rule