You are given a code:

def main_solution(x):
    return func_9(('pjgi').swapcase())

Can you predict the output of `main_solution("rizcgfca")` 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": "rizcgfca"}, "ref_output": "PJGIIGJP", "ref_code": "def main_solution(x):\n    return func_9(('pjgi').swapcase())", "funcname": "main_solution"}
rule