#include <bits/stdc++.h>
using namespace std;
const long long MIN = 1e3 + 2;
const long long MXN = 1e6 + 3;
const long long INF = 1e9 + 7;
const long long LINF = 1e18 + 15;
const long double EPS = 1e-9;
long long n, a[MXN], ans, l = 1, c[MXN], d[MXN], e;
set<long long> s;
map<long long, long long> used;
int main() {
  cin >> n;
  for (long long i = 1; i <= n; i++) {
    cin >> a[i];
    s.insert(a[i]);
  }
  if (n - s.size() == 0) {
    cout << -1;
    return 0;
  }
  for (long long i = 1; i <= n; i++) {
    used[a[i]]++;
    if (used[a[i]] == 2) {
      ans++;
      c[ans] = l;
      d[ans] = i;
      l = i + 1;
      for (long long j = d[ans]; j >= c[ans]; j--) {
        used[a[j]] = 0;
      }
    }
  }
  if (d[ans] != n) {
    d[ans] = n;
  }
  cout << ans << "\n";
  for (long long i = 1; i <= ans; i++) {
    cout << c[i] << " " << d[i] << "\n";
  }
  return 0;
}
