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)

s = STDIN.gets.chomp

def unbalance?(string)
  h = {}
  string.each_char do |c|
    h[c] = (h[c] || 0) + 1
  end
  h.values.any? {|v| v * 2 > string.length }
end

a = 0
b = 3
loop do
  if unbalance?(s[a, b - a])
    puts "#{a + 1} #{b}"
    break
  end

  if b - a >= 2
    a += 1 #TODO
  else
    b += 1 #TODO
    if b > s.length
      puts '-1 -1'
      break
    end
  end
end