#include<stdio.h>

int cuv,l;
bool y;
char x;

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