You are given a code:

def main_solution(x):
    return ((x + 'zfc') + func_20('uxa', 'evkqic'))

Can you predict the output of `main_solution("pej")` 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": "pej"}, "ref_output": "pejzfcuexvakqic", "ref_code": "def main_solution(x):\n    return ((x + 'zfc') + func_20('uxa', 'evkqic'))", "funcname": "main_solution"}
rule