You are given a code:

def main_solution(x):
    return (func_19('hkr', 3) + func_5('bor', 'jzbj'))

Can you predict the output of `main_solution("kpw")` 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": "kpw"}, "ref_output": "hkrjzbjbor", "ref_code": "def main_solution(x):\n    return (func_19('hkr', 3) + func_5('bor', 'jzbj'))", "funcname": "main_solution"}
rule