#include<stdio.h>
int main ()
{
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);
char c,cc;
int cuv=0,lit=0;
cc=1;
while(scanf("%c",&c)!=EOF)
	{if(((c>='a'&&c<='z')||(c>='A'&&c<='Z'))&&(cc==0))
		lit++;
	if(((c>='a'&&c<='z')||(c>='A'&&c<='Z'))&&(cc==1))
		{cc=0;
		cuv++;
		lit++;
		}
	if((c<'a'&&c>'Z')||(c>'z')||(c<'A'))
		cc=1;
	}
printf("%d",lit/cuv);
return 0;
}