You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('zxmtp', x))

Can you predict the output of `main_solution("gnshwtniga")` 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": "gnshwtniga"}, "ref_output": "\u00abzgg\u00bbx\u00abnnm\u00bbs\u00abtsh\u00bbp\u00abwht\u00bbn\u00abiwg\u00bba\u00abt\u00bb\u00abn\u00bb\u00abi\u00bb\u00abg\u00bb\u00aba\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('zxmtp', x))", "funcname": "main_solution"}
rule