#include<stdio.h>
#include<string.h>

int main()
{
 int x,i,nr,cuv;
 char s[10000];
 FILE *f=fopen("text.in","r");
 FILE *g=fopen("text.out","w");

 fgets(s,10000,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))
 {
  x=i;
  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);
}