#include <bits/stdc++.h>
const long long lim = 1e5 + 5;
using namespace std;
long long dx[] = {0, 1, 0, -1};
long long dy[] = {1, 0, -1, 0};
bool vis[lim];
long long n, m, k, x, y, z, ans, cnt, sum;
vector<pair<long long, long long> > adj[100005];
long long power(long long a, long long b) {
  long long res = 1;
  while (b > 0) {
    if (b & 1) res = (res * a);
    a = (a * a);
    b >>= 1;
  }
  return res;
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  ;
  long long t = 1;
  while (t--) {
    cin >> n;
    long long a[n + 3];
    ;
    for (long long i = 1; i < n + 1; i++) cin >> a[i];
    vector<pair<long long, long long> > v;
    long long st = 1;
    map<long long, long long> mp;
    ;
    for (long long i = 1; i < n + 1; i++) {
      if (mp[a[i]]) {
        v.push_back({st, i});
        st = i + 1;
        mp.clear();
      } else
        mp[a[i]] = i;
    }
    if ((long long)v.size() == 0) {
      cout << -1;
      return 0;
    }
    m = (long long)v.size();
    if (v[m - 1].second != n) {
      pair<long long, long long> k = v[m - 1];
      v.pop_back();
      v.push_back({k.first, n});
    }
    cout << (long long)v.size() << "\n";
    ;
    for (long long i = 0; i < (long long)v.size(); i++)
      cout << v[i].first << " " << v[i].second << "\n";
  }
}
