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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>

int main(void)
{
  char s[100000],buf[100000];
  int i,j,k,l,m,len,judge = 1;
  int count[26];

  scanf("%s",s);
  len = strlen(s);

  for(i = 3;i <= len;i++)
    for(j = 0;j <= len - i;j++)
      {
        for(k = j;k < j + i;k++)
          buf[k - j] = s[k];
        buf[i] = '\0';

        for(l = 0;l < strlen(buf);l++)
          count[buf[l] - 'a']++;

        for(m = 0;m < 26;m++)
          if(count[m] > strlen(buf) / 2)
            judge = 0;

        if(judge == 0)
        {
          printf("%d %d\n",j + 1,j + i);
          return 0;
        }
        else
          for(m = 0;m < 26;m++)
            count[m] = 0;
      }
  printf("-1 -1\n");
  return 0;

}