#include<stdio.h>
#include<string.h>

int main(void){
	int m;
	int i, j;
	int pos;
	int ct1 = 0;
	int ct2 = 0;
	int ct3 = 0;
	int ct4 = 0;
	int ct5 = 0;
	int flag = 0;
	char ch[40][11] = {{'\0'}};
	
	while(1){
		scanf("%d", &m);
		if ( m == 0 ) {
			break;
		}
		for ( i = 0; i < m; i++ ) {
			scanf("%s", ch[i]);
		}
	
		for ( i = 0; i < m; i++ ) {
			pos = i;
			ct1 = strlen(ch[i]);;
			ct2 = 0;
			ct3 = 0;
			ct4 = 0;
			ct5 = 0;
			flag = 0;
			for ( j = i + 1; j < m; j++ ) {
				if ( ct1 < 5 ) {
					ct1 += strlen(ch[j]);
				} else if ( ct2 < 7 ) {
					ct2 += strlen(ch[j]);
				} else if ( ct3 < 5 ) {
					ct3 += strlen(ch[j]);
				} else if ( ct4 < 7 ) {
					ct4 += strlen(ch[j]);
				} else if ( ct5 < 7 ) {
					ct5 += strlen(ch[j]);
				}
				if ( ct1 == 5 && ct2 == 7 && ct3 == 5 && ct4 == 7 && ct5 == 7 ) {
					flag = 1;
					break;
				} else if ( ct1 > 5 || ct2 > 7 || ct3 > 5 || ct4 > 7 || ct5 > 7 ) {
					break;
				}
			}
			if ( flag ) {
				break;
			}
		}
		printf("%d\n", pos+1);
	}
	return 0;
}
