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: Accepted)

<?php
fscanf(STDIN, "%s", $s);
$length = strlen($s);
$text = check_string($s, $length);
echo $text;
function check_string($s, $length)
{
    $output1 = -1;
    $output2 = -1;
    for ($i = 0; $i < $length; ++$i) {
        if (($i < $length - 1) && ($s[$i] == $s[$i + 1])) {
            $output1 = $i;
            $output2 = $i + 1;
        }
        if (($i < $length - 2) && ($s[$i] == $s[$i + 2])) {
            $output1 = $i;
            $output2 = $i + 2;
        }
    }
    if ($output1 == -1 && $output2 == -1) {
        echo $output1 . " " . $output2;
    } else {
        echo ($output1 + 1) . " " . ($output2 + 1);
    }
}