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 PHP7 (7.0.15) (judge verdict: Wrong Answer)

<?php

while ($stdin = fgets(STDIN)) {
    $line[] = trim($stdin);
}
foreach ($line as $key => $value) {
    $data[] = explode(' ', $value);
}

//foreach ($data as &$line) {
//    $line = array_map(function($val) { return (int)$val; }, $line);
//}


$s = $data[0][0];
$length = strlen($s);

$unbalance = false;
$unbalancePoint = null;
for ($i = 0; $i < $length - 1; $i++) {
var_dump(substr($s, $i, 1) . '/' . substr($s, $i+1, 1));
    if (substr($s, $i, 1) === substr($s, $i+1, 1)) {
        $unbalance = true;
        $unbalancePoint = [$i+1, $i+2];
    }
}

if (!$unbalance) {
    for ($i = 0; $i < $length - 2; $i++) {
        $threestr = substr($s, $i, 3);
        $one = substr($threestr, 0, 1);
        $two = substr($threestr, 1, 1);
        $three = substr($threestr, 2, 1);
        if ($one === $two || $one === $three || $two === $three) {
            $unbalance = true;
            $unbalancePoint = [$i+1, $i+3];
        }
    }
}

$ans = $unbalance ? $unbalancePoint[0] . ' ' . $unbalancePoint[1] : '-1 -1';

printf('%s', $ans);