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

int main(void){
	int n,n_l[40],count=0,cap=0;
	char w[10];
	scanf("%d",&n);

	int i;
	while(n!=0){
		for(i=0;i<n;i++){
			scanf("%s",w);
			n_l[i]=strlen(w);
		}
		for(i=0;;i++){
			count=0;
			cap=0;
			while(count<5){
				count+=n_l[i+cap];
				cap++;
			}
			if(count!=5)
				continue;
			count=0;
			while(count<7){
				count+=n_l[i+cap];
				cap++;
			}
			if(count!=7)
				continue;
			count=0;
			while(count<5){
				count+=n_l[i+cap];
				cap++;
			}
			if(count!=5)
				continue;
			count=0;
			while(count<7){
				count+=n_l[i+cap];
				cap++;
			}
			if(count!=7)
				continue;
			count=0;
			while(count<7){
				count+=n_l[i+cap];
				cap++;
			}
			if(count!=7)
				continue;
			break;
		}
		printf("%d\n",i+1);
		scanf("%d",&n);
	}
	return 0;
}