#include<stdio.h>
#include<string.h>
FILE *f=fopen("text.in","r"),*g=fopen("text.out","w");
int main()
{
 char str[10000];
 int l,i,w;
 long int ncu=0,nch=0;
 while(!feof(f))
 {
   fscanf(f,"%s",str);
   l=strlen(str);
   w=0;
   for(i=0;i<l;i++)
     if((64<str[i]&&str[i]<91)||(96<str[i]&&str[i]<123))
     {
       if(!w) {w=1;ncu++;}
       nch++;
     }
     else w=0;
 }
 fprintf(g,"%ld",nch/ncu);
 return 0;
}