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: Wrong Answer)

#include <iostream>
#include <string>
#include <algorithm>
#include <map>
#include <set>
#include <vector>
#include <queue>
#include <cmath>

#define	MOD 1000000007;
#define PI 3.14159265358979323846;
#define rep(i,n) for(ll i = 0;i<(ll)n;i++)
using namespace std;
typedef long long ll;
static const int MAX = 50;
static const long long INFTYL = 9223372036854775807;
ll mod = 1000000007;

int main()
{
	string s;
	cin >> s;
	rep(i, s.size()) {
		if (i == 0) {
			continue;
		}
		if ((s[i - 1] == s[i] && s[i] != s[i + 1]) ||
			(s[i - 1] != s[i] && s[i] == s[i + 1]) ||
			(s[i - 1] == s[i + 1] && s[i - 1] != s[i] && s[i] != s[i + 1]))
		{
			cout << i - 1 + 1 << " " << i + 1 + 1 << endl;
			return 0;
		}
	}
	cout << -1 << " " << -1 << endl;

	return 0;
}