You are given a code:

def main_solution(x):
    return func_13(func_5(x, 'znjy'), '_')

Can you predict the output of `main_solution("eanivc")` 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": "eanivc"}, "ref_output": "z_n_j_y_e_a_n_i_v_c", "ref_code": "def main_solution(x):\n    return func_13(func_5(x, 'znjy'), '_')", "funcname": "main_solution"}
rule