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 Haskell (GHC 7.10.3) (judge verdict: Wrong Answer)

import Data.Maybe

main = do
  input <- getLine
  let ans = solve 1 input
  if ans == Nothing then putStrLn "-1 -1"
                    else putStrLn $ (\(x, y) -> show x ++ " " ++ show y) . fromJust $ ans

solve :: Int -> String -> Maybe (Int, Int)
solve n [] = Nothing
solve n (a:[]) = Nothing
solve n (a:b:[])
  | a == b = Just (n, n+2)
  | otherwise = Nothing
solve n (a:b:c:cs)
  | a == b || a == c || b == c = Just (n, n+2)
  | otherwise                  = solve (n+1) (b:c:cs)