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 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>

int main(){
  char s[100100];
  for(int i=0;i<=100010;i++){
    s[i]='A';
  }
  scanf("%s",s);
  
  int a['z'-'a'][100010],b['z'-'a'];
  for(int i=0;i<='z'-'a';i++){
    b[i]=0;
  }
  
  for(int i=0;i<=100001;i++){
    if(s[i]-'a' < 0){
      break;
    }
    b[s[i]-'a']+=1;
    a[s[i]-'a'][b[s[i]-'a']]=i;
  }
  
  int flag=0;
  
  for(int i=0;i<='z'-'a'-1;i++){
    if(b[i]<=1){
      continue;
    }
    for(int j=1;j<=b[i]-1;j++){
      for(int k=j+1;k<=b[i];k++){
        if(a[i][k]-a[i][j]+1 < 2*(k-j+1)){
          flag=1;
          printf("%d %d",a[i][j]+1,a[i][k]+1);
          break;
        }
        if(flag==1){
          break;
        }
      }
      if(flag==1){
        break;
      }
    }
    if(flag==1){
      break;
    }
  }
  
  if(flag==0){
    printf("-1 -1");
  }
  
  return 0;
}