secvzero_pbinfo

#include <iostream>

using namespace std;

int main() {
  int n, nr, l, st, stmax, lmax;
  cin >> n;
  l = lmax = 0;
  for (int i = 1; i <= n; i ++) {
    cin >> nr;
    if (nr == 0)
      l ++;
    else
      l = 0;
    if (l == 1)
      st = i;
    if (l > lmax) {
      lmax = l;
      stmax = st;
    }
  }
  cout << stmax << " " << stmax + lmax - 1;
  return 0;
}