You are given a code:

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

Can you predict the output of `main_solution("lzkbvyszsd")` 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": "lzkbvyszsd"}, "ref_output": "\u00ablm_\u00bbz\u00ab_vk\u00bb_\u00abbr_\u00bbv\u00ab_ny\u00bb_\u00absj_\u00bbz\u00ab_js\u00bb_d", "ref_code": "def main_solution(x):\n    return func_20(func_15('mvrnjj'), func_13(x, '_'))", "funcname": "main_solution"}
rule