using System;

public class Program

{

    // A unique character is one which apperas only once in a string. Given a string consisting of lowercase English letters only, 

    //return the index of the first occurence of a unique character in the string using 1-based indexing. If the string doesn't contain any unique character, return -1

    //

    // Example, s= "statistics".

    //The unique characters are [a, c] among which a occurs first. Using 1-based indexing, it is at index 3.

    public static void Main()

    {

        Console.WriteLine(GetUniqueCharacter("satt"));

    }

    public static int GetUniqueCharacter(string s)

    {

        bool counter = true;

        for(int i = 0 ; i < s.Length; i++){

            counter = true;

            for(int j = i+1 ; j < s.Length;j++){

                if(s[i] == s[j]){

                    counter = false;

                    break;

                }

        }

            if(counter){

                    return i+1;

                }

        }

        return -1;

    }

}