You are given a code:

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

Can you predict the output of `main_solution("nfgrvqmjxf")` 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": "nfgrvqmjxf"}, "ref_output": "n|f|g|r|v|q|m|j|x|f|y|i|o|c|r|s", "ref_code": "def main_solution(x):\n    return func_13((x + 'yiocrs'), '|')", "funcname": "main_solution"}
rule