#include<string.h>
#include<stdio.h>
#include<string.h>
#define NM 2048576

int main()
{
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);
int i,cuv=0,car=0,l;
char s,c=' ';
while(scanf("%c",&s)!=EOF)
	{
	if(s>='a'&&s<='z'||s>='A'&&s<='Z')
	  {
		car++;
		if(!(c>='a'&&c<='z'||c>='A'&&c<='Z'))cuv++;
		}
	c=s[i];
	}
if(car==0) fout<<"0";
else
fout<<car/cuv;
return 0;
}