You are given a code:

def main_solution(x):
    return func_13(('kyhrcw' + x), '_')

Can you predict the output of `main_solution("ywxfcirnnt")` 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": "ywxfcirnnt"}, "ref_output": "k_y_h_r_c_w_y_w_x_f_c_i_r_n_n_t", "ref_code": "def main_solution(x):\n    return func_13(('kyhrcw' + x), '_')", "funcname": "main_solution"}
rule