Let a, b and c be complex numbers such that |a|=|b|=|c|=1 and

Let a, b and c be complex numbers such that |a|=|b|=|c|=1 and

 \(\frac{a^2}{bc} + \frac{b^2}{ac} + \frac{c^2}{ab} = -1.\)

Find all possible values of |a+b+c|

Enter all the possible values, separated by commas.