You are given a code:

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

Can you predict the output of `main_solution("ulahyvrp")` 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": "ulahyvrp"}, "ref_output": "l|a|h|f|i|e|x|v|l|w|r", "ref_code": "def main_solution(x):\n    return func_13(('lahfie' + 'xvlwr'), '|')", "funcname": "main_solution"}
rule