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.Linq;using System.Collections.Generic;

class A {
	static void Main() {
		var n = Console.ReadLine();
		if(n.Length < 2) {
			Console.WriteLine("-1 -1");
			return;
		}
		var dic = new Dictionary<Char,int>();
		var c = ' ';
		foreach(var i in n) {
			if(dic.ContainsKey(i)) {
				dic[i]++;
			} else {
				dic[i] = 1;
			}
			if(dic[i] >= n.Length/2) {
				c = i;
			}
		}

		if(!(dic.Count() == 2 && dic[c] == n.Length / 2)) {
			var s = new string(new char[] { c,c });
			var num = n.IndexOf(s);
			Console.WriteLine(num + " " + (num + 2));
		} else {

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