You are given a code:

def main_solution(x):
    return (func_13(x, '_') + func_20('ews', 'alwr'))

Can you predict the output of `main_solution("uchbhfhoyv")` 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": "uchbhfhoyv"}, "ref_output": "u_c_h_b_h_f_h_o_y_veawlswr", "ref_code": "def main_solution(x):\n    return (func_13(x, '_') + func_20('ews', 'alwr'))", "funcname": "main_solution"}
rule