You are given a code:

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

Can you predict the output of `main_solution("twyta")` 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": "twyta"}, "ref_output": "t_x_w_b_y_q_t_l_a_d", "ref_code": "def main_solution(x):\n    return func_13(func_20(x, 'xbqld'), '_')", "funcname": "main_solution"}
rule