#include<stdio.h>  
  
int verif(char c)  
{  
 if(c>=65 && c<=90) return 1;  
 if(c>=97 && c<=122) return 1;  
 return 0;  
}  
  
int main()  
{  
 char c;  
 int len=0,cuv=0,k=0;  
 freopen("text.in","r",stdin);
 freopen("text.out","w",stdout);
 while(scanf("%c",&c)!=EOF)  
 {  
  if(verif(c)==1)
  { 
   len++; 
   if(k==0) { cuv++; k=1; }
         else k=0;
  }
 }   
 printf("%d",len/cuv);  
 return 0;  
}