You are given a code:

def main_solution(x):
    return func_20(func_11(x, 4), func_15('wtcmsk'))

Can you predict the output of `main_solution("ysommorj")` 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": "ysommorj"}, "ref_output": "c\u00abwws\u00bbq\u00abqts\u00bbv\u00abnc\u00bb\u00abm\u00bb\u00abs\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_11(x, 4), func_15('wtcmsk'))", "funcname": "main_solution"}
rule