You are given a code:

def main_solution(x):
    return func_5('gfv', 'gpp')

Can you predict the output of `main_solution("xbtjhelws")` 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": "xbtjhelws"}, "ref_output": "gppgfv", "ref_code": "def main_solution(x):\n    return func_5('gfv', 'gpp')", "funcname": "main_solution"}
rule