You are given a code:

def main_solution(x):
    return func_15(('ulrmws').swapcase())

Can you predict the output of `main_solution("gojcz")` 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": "gojcz"}, "ref_output": "\u00abU\u00bb\u00abL\u00bb\u00abR\u00bb\u00abM\u00bb\u00abW\u00bb\u00abS\u00bb", "ref_code": "def main_solution(x):\n    return func_15(('ulrmws').swapcase())", "funcname": "main_solution"}
rule