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

char s1,stv=' ';
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(s1)){nrlit++; stv=s1;   }
else {
if(litera(stv)){ nrcuv++; stv=s1;  }
}
}


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