You are given a code:

def main_solution(x):
    return (func_15('rvobf') + func_5('iem', 'pp'))

Can you predict the output of `main_solution("tgtqlbcs")` 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": "tgtqlbcs"}, "ref_output": "\u00abr\u00bb\u00abv\u00bb\u00abo\u00bb\u00abb\u00bb\u00abf\u00bbppiem", "ref_code": "def main_solution(x):\n    return (func_15('rvobf') + func_5('iem', 'pp'))", "funcname": "main_solution"}
rule