You are given a code:

def main_solution(x):
    return func_20(('tzi' + 'purvim'), func_15('svvnqr'))

Can you predict the output of `main_solution("xpo")` 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": "xpo"}, "ref_output": "t\u00abzsi\u00bbp\u00abuvr\u00bbv\u00abivm\u00bb\u00abn\u00bb\u00abq\u00bb\u00abr\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('tzi' + 'purvim'), func_15('svvnqr'))", "funcname": "main_solution"}
rule