You are given a code:

def main_solution(x):
    return func_1(func_13('ivfnyj', '-'), 4)

Can you predict the output of `main_solution("wld")` 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": "wld"}, "ref_output": "i-v-f-n-y-ji-v-f-n-y-ji-v-f-n-y-ji-v-f-n-y-j", "ref_code": "def main_solution(x):\n    return func_1(func_13('ivfnyj', '-'), 4)", "funcname": "main_solution"}
rule