#include <stdio.h>  
   int n,i,lit,j,cuv;  
   char x[100000];  
   int main()  
   {  
       freopen("text.in","r",stdin);  
       freopen("text.out","w",stdout);  
       i=0;  
           lit=0;  
       do  
       {  
           i=i+1;  
           scanf("%c",&x[i]);  
       }  
       while(x[i]!=0);  
           j=i;  
       for(i=1;i<=j;i++)  
        {  
               if ((x[i]>='a' && x[i]<='z') || (x[i]>='A' && x[i]<='Z'))  
               lit=lit+1;  
               else  
           if ((x[i+1]>='a' && x[i+1]<='z') || (x[i+1]>='A' && x[i+1]<='Z'))  
               cuv=cuv+1;  
            }  
      printf("%d",lit/cuv);  
      return 0;  
   }