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 9.2.1) (judge verdict: Wrong Answer)

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

int main(){
    char s[100000];
    scanf("%s",s);
    int len=strlen(s);

    int alpha[26]={0};
    for(int k=0;k<len;k++){
        alpha[s[k]-'a']++;
    }
    int max=alpha[0];
    for(int k=1;k<26;k++){
        if(alpha[k]>max){
            max=alpha[k];
        }
    }

    int i=0;
    if(2*max<=len){
        while(2*max<=(len-i)){
            i++;
            for(int k=0;k<26;k++){
                alpha[k]=0;
            }
            for(int k=((i+1)/2);k<(len-i/2);k++){
                alpha[s[k]-'a']++;
            }
            max=alpha[0];
            for(int k=1;k<26;k++){
                if(alpha[k]>max){
                    max=alpha[k];
                }
            }
        }
    }

    if(i==(len-1)){
        printf("%d %d",-1,-1);
    }else{
        printf("%d %d",(i+3)/2,len-i/2);
    }
    return 0;
}