#include<stdio.h>

int lit (char c)
{
	if(c>='a' && c<='z' || c>='A' && c<='Z') return 1;
	return 0;
}

int main()
{
	freopen("text.in","rt",stdin);
	freopen("text.out","wt",stdout);
	long nr=0,l=0;
	char c;
	
	while(scanf("%c",&c)==1)
		{
		if(lit(c))
			{
			nr++;
			l++;
			while(scanf("%c",&c)==1)
				if(lit(c)) l++;
				else break;
			}
		}
	
	printf("%ld\n",l/nr);
	return 0;
}