import java.util.Scanner;
 
class Solution {
    public int firstUniqChar(String s) {
        int[] freq = new int[26];
 
        for (char ch : s.toCharArray()) {
            freq[ch - 'a']++;
        }
 
        for (int i = 0; i < s.length(); i++) {
            if (freq[s.charAt(i) - 'a'] == 1) {
                return i;
            }
        }
 
        return -1;
    }
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
 
        Solution solution = new Solution();
        int index = solution.firstUniqChar(s);
 
        if (index != -1) {
            System.out.println("First unique character is at index: " + index);
        } else {
            System.out.println("No unique character found.");
        }
    }
}
 

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