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++ (Clang 10.0.0) (judge verdict: Wrong Answer)

#include <iostream>
#include <map>
#include <vector>
using namespace std;

pair<int, int> getResult(const string &s){
  const size_t sSize = s.size();
  pair<int, int> range = {-1, -1};
  if(sSize < 2){
    return range;
  }

  map<char, vector<unsigned int>> charInfo;
  for(size_t i = 0; i < sSize; i++){
    charInfo[s[i]].push_back(i+1);
  }
  
  for(auto itr = charInfo.begin(); itr != charInfo.end(); itr++){
    size_t charCnt = itr->second.size();
    if(charCnt < 2) continue;
    unsigned int partStrHalfCnt = (itr->second.back() + 1 - itr->second[0]) / 2;
    if(charCnt > partStrHalfCnt){
      range.first = itr->second[0];
      range.second = itr->second.back();
      break;
    }
  }

  return range;
}

int main(){
  string s;
  cin >> s;
  pair<int, int> result = getResult(s);
  cout << result.first << " " << result.second << endl;
}