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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
#include <algorithm>
#include <cmath>
#include <math.h>
#include <cstdio>
using namespace std;
#define PI acos(-1,0)
#define eps 1e-10
#define ll long long
#define mst(ss,b) memset((ss),(b),sizeof(ss))
using namespace std;
int main()
{
    int flag=0;
    string s;
    cin>>s;
    for(int i=0;i<s.length()-1;i++)
    {
        if(s[i]==s[i+1])
        {
            cout<<i+1<<" "<<i+2<<endl;
            flag=1;
            break;
        }
        else if(i<s.length()-2&&s[i]==s[i+2])
        {
            cout<<i+1<<" "<<i+3<<endl;
            flag=1;
            break;
        }
    }
    if(flag!=1)
    cout<<-1<<" "<<-1<<endl;
    return 0;
}