You are given a code:

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

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