You are given a code:

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

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