You are given a code:

def main_solution(x):
    return func_20((x + 'msvkv'), func_15('zfe'))

Can you predict the output of `main_solution("roihpjwk")` 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": "roihpjwk"}, "ref_output": "r\u00abozi\u00bbh\u00abpfj\u00bbw\u00abkem\u00bbsvkv", "ref_code": "def main_solution(x):\n    return func_20((x + 'msvkv'), func_15('zfe'))", "funcname": "main_solution"}
rule