#include <iostream>
#include <vector>
#include <string>
using namespace std;

int len[5] = {5, 7, 5, 7, 7};

int main() {
  int N;
  while (cin >> N, N) {
    vector<string> a(N); for (int i = 0; i < N; ++i) cin >> a[i];
    for (int i = 0; i < N; ++i) {
      bool ok = true;
      int j = i;
      for (int it = 0; it < 5; ++it) {
        string str = "";
        while (j < N && str.size() < len[it]) str += a[j++];
        if (str.size() != len[it]) {
          ok = false;
          break;
        }
      }
      if (ok) {
        cout << i+1 << endl;
        break;
      }
    }
  }
}