You are given a code:

def main_solution(x):
    return func_1(func_13('ybgqam', '_'), 4)

Can you predict the output of `main_solution("xwhzdafv")` 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": "xwhzdafv"}, "ref_output": "y_b_g_q_a_my_b_g_q_a_my_b_g_q_a_my_b_g_q_a_m", "ref_code": "def main_solution(x):\n    return func_1(func_13('ybgqam', '_'), 4)", "funcname": "main_solution"}
rule