#include<stdio.h>
#include<string.h>
 
int main()
{
 int i,nr,cuv;
 char s[1000000];
 FILE *f=fopen("text.in","r");
 FILE *g=fopen("text.out","w");
 
 fgets(s,1000000,f);
 i=0;
 while(i<strlen(s)&&(!((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))))
     i++;
  
 nr=0;
 cuv=0;
  
 while(i<strlen(s))
 {

  while(i<strlen(s)&&((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')))
  {
   nr++;
   i++;
  }
  cuv++;
  while(i<strlen(s)&&(!((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))))
    i++;
 }
  
 fprintf(g,"%d",nr/cuv);
 fclose(f);
 fclose(g);
}