#include <bits/stdc++.h>
using namespace std;
int main() {
  vector<int> num = {5, 7, 5, 7, 7};
  int n;
  while (std::cin >> n, n) {
    vector<string> vs(n);
    for (int i = 0; i < n; i++) std::cin >> vs[i];
    for (int i = 0; i < n; i++) {
      int sum = 0, pos = 0;
      for (int j = i; j < n; j++) {
        sum += vs[j].size();
        if (sum == num[pos]) sum = 0, pos++;
        if (pos == 5) {
          std::cout << i + 1 << std::endl;
          i = j = 1e9;
        }
      }
    }
  }
  return 0;
}
