You are given a code:

def main_solution(x):
    return func_20(func_1('iemjeu', 4), func_15('wfvvx'))

Can you predict the output of `main_solution("plfkicv")` 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": "plfkicv"}, "ref_output": "i\u00abewm\u00bbj\u00abefu\u00bbi\u00abevm\u00bbj\u00abevu\u00bbi\u00abexm\u00bbjeuiemjeu", "ref_code": "def main_solution(x):\n    return func_20(func_1('iemjeu', 4), func_15('wfvvx'))", "funcname": "main_solution"}
rule