#include<stdio.h>
int lit,cuv;
char u,l;

int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	scanf("%c",&u);
	if(u>='A' && u<='Z' || u>='a' && u<='z')
	{
		lit++;
		cuv++;
	}
	while(scanf("%c",&l)!=EOF)
	{
		if(!(l>='A' && l<='Z' || l>='a' && l<='z'))
		{
			u = l;
			continue;
		}
		lit++;
		if(!(u>='A' && u<='Z' || u>='a' && u<='z'))
			cuv++;
		u=l;
	}
	printf("%d",lit/cuv);
	return 0;
}