Problem:
Score : 400 points

Problem Statement

Given a string t, we will call it unbalanced if and only if the length of t is at least 2, and more than half of the letters in t are the same. For example, both voodoo and melee are unbalanced, while neither noon nor a is.

You are given a string s consisting of lowercase letters. Determine if there exists a (contiguous) substring of s that is unbalanced. If the answer is positive, show a position where such a substring occurs in s.

Constraints

2 ≦ |s| ≦ 10^5

s consists of lowercase letters.

Partial Score

200 points will be awarded for passing the test set satisfying 2 ≦ N ≦ 100.

Input

The input is given from Standard Input in the following format:

s

Output

If there exists no unbalanced substring of s, print -1 -1.

If there exists an unbalanced substring of s, let one such substring be s_a s_{a+1} ... s_{b} (1 ≦ a < b ≦ |s|), and print a b. If there exists more than one such substring, any of them will be accepted.

Sample Input 1

needed

Sample Output 1

2 5

The string s_2 s_3 s_4 s_5 = eede is unbalanced. There are also other unbalanced substrings. For example, the output 2 6 will also be accepted.

Sample Input 2

atcoder

Sample Output 2

-1 -1

The string atcoder contains no unbalanced substring.

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)





using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace tes
{
	class contest
	{
		static void Main(string[] args)
		{
			string input = Console.ReadLine();
            char target = ' ';
            int count = 0;
            bool check = false;

            for(int i=0; i<=(input.Length/2)+1; i++)
            {
                int temp = 0;
                temp = input.Where(s => s == input[i]).Count();
                if (count < temp) target = input[i];
                count = Math.Max(count, temp);
                if((input.LastIndexOf(target)-input.IndexOf(target))+1 >input.Length/2)
                {
                    Console.WriteLine((input.IndexOf(target)+1).ToString()+' '+(input.LastIndexOf(target)+1).ToString());
                    check = true;
                    break;
                }

            }
            if(!check) Console.WriteLine("-1 -1");
            
		}

	}
}