You are given a code:

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

Can you predict the output of `main_solution("ifevrowpe")` 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": "ifevrowpe"}, "ref_output": "i|f|e|v|r|o|w|p|ei_f_e_v_r_o_w_p_e", "ref_code": "def main_solution(x):\n    return (func_13(x, '|') + func_13(x, '_'))", "funcname": "main_solution"}
rule