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

int main() {
	while (true) {
		int n;
		cin >> n;

		if (n == 0)
			break;

		int len[40];
		for (int i = 0;i < n;i++) {
			string w;
			cin >> w;

			len[i] = w.size();
		}

		for (int i = 0;i < n;i++) {
			bool flg = false;
			int sta = 0;
			int sum = 0;

			for (int j = i;j < n;j++) {
				sum += len[j];

				//区切りなら
				if (sum == 5 || sum == 12 || sum == 17 || sum == 24 || sum == 31) {
					sta++;
				}

				if (sta == 5) {
					flg = true;
					break;
				}
				else if (sum >= 31) {
					break;
				}
			}
			if (flg) {
				cout << i + 1 << endl;
				break;
			}
		}
	}
	return 0;
}
