You are given a code:

def main_solution(x):
    return func_13(func_20('tyojp', x), '_')

Can you predict the output of `main_solution("wsrcua")` 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": "wsrcua"}, "ref_output": "t_w_y_s_o_r_j_c_p_u_a", "ref_code": "def main_solution(x):\n    return func_13(func_20('tyojp', x), '_')", "funcname": "main_solution"}
rule