Contest: Task: Related: TaskA TaskC

Score : $400$ points

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 $s$.

- $2 ≦ |s| ≦ 10^5$
- $s$ consists of lowercase letters.

- $200$ points will be awarded for passing the test set satisfying $2 ≦ N ≦ 100$.

The input is given from Standard Input in the following format:

$s$

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.

needed

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.

atcoder

-1 -1

The string `atcoder`

contains no unbalanced substring.