#include<stdio.h>
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	int c,lit=0,cuv=0,x,k=0;
	while(scanf("%c",&c) != EOF){

		if(('A'<=c&&c<='Z')||('a'<=c&&c<='z')){
			lit++;
			k=c;
	     }else{
			if(lit!=0&&(('A'<=k&&k<='Z')||('a'<=k&&k<='z'))){
				cuv++;
			}
		}
	}
	x=lit/cuv;
	printf("%d",x);

return 0;
}