You are given a code:

def main_solution(x):
    return func_20(func_15('ijkubi'), func_11(x, 1))

Can you predict the output of `main_solution("zkmtlcsw")` 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": "zkmtlcsw"}, "ref_output": "\u00abail\u00bbn\u00abujm\u00bbd\u00abtkx\u00bb\u00abu\u00bb\u00abb\u00bb\u00abi\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('ijkubi'), func_11(x, 1))", "funcname": "main_solution"}
rule