You are given a code:

def main_solution(x):
    return func_13(func_20('hyaykj', 'kvcnmu'), '_')

Can you predict the output of `main_solution("ipel")` 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": "ipel"}, "ref_output": "h_k_y_v_a_c_y_n_k_m_j_u", "ref_code": "def main_solution(x):\n    return func_13(func_20('hyaykj', 'kvcnmu'), '_')", "funcname": "main_solution"}
rule