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 Ruby (2.3.3) (judge verdict: Wrong Answer)

def check(offset, words)
  h = {}
  border = words.size / 2.0
  words.each_with_index do |w,i|
    v = h[w]
    if v
      c = v[0] + 1
      h[w] = [c, v[1]]
    else
      c = 1
      h[w] = [c, i]
    end
    if c > border
      s = offset + v[1] + 1
      e = s + 2
      return "#{s} #{e}"
    end
  end
  nil
end

words = gets.split('')
(words.size - 3).times do |i|
  parts = words[i, 3]
  result = check(i, parts)
  if result
    puts result
    exit 
  end
end
puts "-1 -1"