#include<stdio.h>   
#include<string.h>   
int main()   
{   
   long int num=0,s=0,s2,v,i,k,c1,verific;   
   char c[1000000];   
   freopen ("text.in","r",stdin);   
   freopen ("text.out","w",stdout);   
   v=0;   
   while (!feof(stdin))   
     {   
       scanf("%s",c);   
       s=strlen(c);verific=0;   
       for (k=0; k<s; k++)   
       { c1=int(c[k]);   
       for (i='a'; i<='z';i++)   
           if (c1==i) {v++; verific=1;break;}   
       if (verific==0)   
       for (i='A'; i<='Z';i++)   
           if (c1==i) {v++; verific=1;break;}   
       }    
       if ((verific==1)||(c[k]=='-'))   
           num++;   
     }   
   if (num!=0){   
   s2=v/num;   
   printf("%ld",num);}   
   else printf("0");   
   return 0;   
}