#include<stdio.h>
using namespace std;
int n,i,k,s,nr,ok;
char c;
int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	c='0';
	while(ok<=10)
	{
		scanf("%c",&c);
		if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
		{
			k++;
			ok=0;
		}
		else
			{
				if(k!=0)
				{
				s=s+k;
				nr++;
				k=0;
				}
				ok++;
			}
				
	}
	printf("%d",s/nr);
	return 0;
}