You are given a code:

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

Can you predict the output of `main_solution("lbctgbgvki")` 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": "lbctgbgvki"}, "ref_output": "l|b|c|t|g|b|g|v|k|i|j|d|h|h|f|r", "ref_code": "def main_solution(x):\n    return func_13((x + 'jdhhfr'), '|')", "funcname": "main_solution"}
rule