You are given a code:

def main_solution(x):
    return func_13((x + 'ydms'), '|')

Can you predict the output of `main_solution("uvvhwqyfb")` 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": "uvvhwqyfb"}, "ref_output": "u|v|v|h|w|q|y|f|b|y|d|m|s", "ref_code": "def main_solution(x):\n    return func_13((x + 'ydms'), '|')", "funcname": "main_solution"}
rule