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 AtCoder
{
	class Program
	{
		static void Main(string[] args)
		{
			var s = Console.ReadLine();

			for(int i = 0; i < s.Length - 1; i++)
			{
				if(s[i] == s[i + 1])
				{
					Console.WriteLine((i + 1) + " " + (i + 2));
					return;
				}
			}

			var list = new List<Dictionary<char, int>>();

			for(int i = 0; i < s.Length; i++)
			{
				var c = s[i];
				list.Add(new Dictionary<char, int>());

				for(int j = 0; j < list.Count; j++)
				{
					var dictionary = list[j];
					if (dictionary.ContainsKey(c))
					{
						dictionary[c]++;
					}
					else
					{
						dictionary.Add(c, 1);
					}

					if(i - j > 1 && dictionary.Values.Max() > (i - j) / 2)
					{
						Console.WriteLine((j + 1) + " " + (i + 1));
						return;
					}
				}
			}

			Console.WriteLine("-1 -1");
		}
	}
}