You are given a code:

def main_solution(x):
    return func_20(func_13('cpkfy', '_'), func_15('usfpob'))

Can you predict the output of `main_solution("ejla")` 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": "ejla"}, "ref_output": "c\u00ab_up\u00bb_\u00abks_\u00bbf\u00ab_fy\u00bb\u00abp\u00bb\u00abo\u00bb\u00abb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_13('cpkfy', '_'), func_15('usfpob'))", "funcname": "main_solution"}
rule