You are given a code:

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

Can you predict the output of `main_solution("cjhrxahipe")` 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": "cjhrxahipe"}, "ref_output": "s_f_s_v_e_q_u_d_t", "ref_code": "def main_solution(x):\n    return func_13(('sfs' + 'vequdt'), '_')", "funcname": "main_solution"}
rule