Hi i need help making a function that implements a negate function into my convert to decimal function in python

input :"++-" output: should be 11

negate(n)

Given a string n representing a balanced ternary number,returns the string representing -n. Hint: you should use this in convert_to_balanced_ternary(n)! If n is invalid, return the empty string

Here is my code below

def convert_to_balanced_ternary(n): conversion = ""

while n>0: conversion = str(n%3) + conversion n = int(n/3) return conversion

print(convert_to_balanced_ternary("++-"))

my code might be wrong