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 PHP (5.6.30) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN, "%s", $ss);
$s = str_split($ss);
$len = count($s);
if ($len == 2) {
    echo '-1 -1';
    return;
}
if ($s[0] == $s[1]) {
    echo '1 2';
    return;
}
$list = [$s[0] => 1, $s[1] => 1];
for ($i = 2; $i < $len; $i++) {
    if (!isset($list[$s[$i]]) || $list[$s[$i]] == 0) {
        $list[$s[$i]] = 1;
    } elseif ($list[$s[$i]] == 1) {
        echo ($i - 1) . ' ' . ($i + 1);
        return;
    }
    $list[$s[$i - 2]]--;
}
echo '-1 -1';