You are given a code:

def main_solution(x):
    return (func_13('lncymg', '|') + func_13('ctfrjj', '_'))

Can you predict the output of `main_solution("oyreztegj")` 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": "oyreztegj"}, "ref_output": "l|n|c|y|m|gc_t_f_r_j_j", "ref_code": "def main_solution(x):\n    return (func_13('lncymg', '|') + func_13('ctfrjj', '_'))", "funcname": "main_solution"}
rule