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: Accepted)

#pragma warning disable

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Text.RegularExpressions;
using System.Diagnostics;
using System.Numerics;
using System.Collections;

static class MainClass
{
    public static void Main(string[] args)
    {
        var before1 = ' ';
        var before2 = ' ';
        var str = Console.ReadLine();
        for (int i = 0; i < str.Length; i++)
        {
            if (i == 0)
            {
                continue;
            }
            else if (i == 1)
            {
                before1 = str[i];
                before2 = str[i - 1];
                if (before1 == before2)
                {
                    Console.WriteLine($"{i} {i + 1}");

                    Console.ReadLine();
                    return;
                }
            }
            else
            {
                if (before1 == before2)
                {
                    Console.WriteLine($"{i - 1} {i + 1}");

                    Console.ReadLine();
                    return;
                }
                else
                {
                    if (before2 == str[i])
                    {
                        Console.WriteLine($"{i - 1} {i + 1}");
                        Console.ReadLine();
                        return;
                    }
                }
                before1 = str[i];
                before2 = str[i - 1];
            }
        }
        Console.WriteLine("-1 -1");

        Console.ReadLine();
    }

    public static bool SystemTest(string str,int a,int b)
    {
        var s = str.Substring(a - 1, b - a + 1);
        var dic = new Dictionary<char, int>();
        foreach (var item in s)
        {
            if (!dic.ContainsKey(item))
                dic.Add(item, 1);
            else
                dic[item]++;
        }
        var max = dic.OrderByDescending(x => x.Value).First();
        if (max.Value > str.Length - max.Value)
        {
            return true;
        }
        else
        {
            return false;
        }
    }


    #region ライブラリ
    public static long ToInt64(this string str) => long.Parse(str);
    public static int ToInt32(this string str) => int.Parse(str);
    public static BigInteger ToBigInteger(this string str) => BigInteger.Parse(str);
    public static List<string> SplittedStringToList(this string str) => str.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).ToList();
    public static List<int> SplittedStringToInt32List(this string str) => str.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Select(x => int.Parse(x)).ToList();
    public static List<long> SplittedStringToInt64List(this string str) => str.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Select(x => long.Parse(x)).ToList();
    public static List<BigInteger> SplittedStringToBigInteger(this string str) => str.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Select(x => BigInteger.Parse(x)).ToList();
    public const int INF = int.MaxValue / 2;
    public const long LONGINF = long.MaxValue / 2;
    public const int Mod1e9 = 1000000007;
    

    public static void PrintArray(int[,] array)
    {
        for (int i = 0; i < array.GetLength(0); i++)
        {
            var sb = new StringBuilder();
            for (int j = 0; j < array.GetLength(1); j++)
            {
                sb.Append(array[i, j]).Append(" ");
            }
            Console.WriteLine(sb.ToString());
        }
    }

    #endregion
}