Problem: The array a with n integers is given. Let's call the sequence of one or more consecutive elements in a segment. Also let's call the segment k-good if it contains no more than k different values.

Find any longest k-good segment.

As the input/output can reach huge size it is recommended to use fast input/output methods: for example, prefer to use scanf/printf instead of cin/cout in C++, prefer to use BufferedReader/PrintWriter instead of Scanner/System.out in Java.

Input

The first line contains two integers n, k (1 ≤ k ≤ n ≤ 5·105) — the number of elements in a and the parameter k.

The second line contains n integers ai (0 ≤ ai ≤ 106) — the elements of the array a.

Output

Print two integers l, r (1 ≤ l ≤ r ≤ n) — the index of the left and the index of the right ends of some k-good longest segment. If there are several longest segments you can print any of them. The elements in a are numbered from 1 to n from left to right.

Examples

Input

5 5
1 2 3 4 5


Output

1 5


Input

9 3
6 5 1 2 3 2 1 4 5


Output

3 7


Input

3 1
1 2 3


Output

1 1

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  scanf("%d", &n);
  set<int> s;
  int left = 1;
  vector<int> st, ed;
  for (int i = 0; i < n; ++i) {
    int x;
    scanf("%d", &x);
    if (s.count(x) > 0) {
      s.clear();
      st.push_back(left);
      ed.push_back(i + 1);
      left = i + 2;
    } else {
      s.insert(x);
    }
  }
  if (st.size() == 0) {
    printf("-1\n");
    return 0;
  }
  printf("%u\n", (int)st.size());
  for (int i = 0; i < st.size(); ++i) {
    if (i == st.size() - 1) {
      printf("%d %d\n", st[i], n);
    } else {
      printf("%d %d\n", st[i], ed[i]);
    }
  }
  return 0;
}