#include<iostream>
#include<stdio.h>
 
using namespace std;
 

char litcur, litpre=' ';
int i,nrlit,nrcuv;
 
 
int litera(char x)
{
	if( ( x>='A' && x<='Z') || (x>='a' && x<='z' ) )
		return 1;
		else return 0;
}
 
int main(){
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);

while((s1=cin.get())!=EOF )
{

	if(litera(litcur)){nrlit++; litpre=litcur;   }
	else {
		if(litera(litpre)){ 
				nrcuv++; litpre=litcur;  }
}
}


printf("%d",nrlit/nrcuv);
 
return 0;}