#include<stdio.h>
char c;
int cuv=0,l=0;
int main()
{
FILE *f=fopen("text.in","r");

int ok=1;
while(!feof(f)&&ok)
{


   if(fscanf(f,"%c",&c)<=0)break;


if(c>=65&&c<=90||c>=97&&c<=122)
    {cuv++;
     while(c>=65&&c<=90||c>=97&&c<=122)
      {l++;
	 if(fscanf(f,"%c",&c)<=0){ok=0;break;}
       }
    }
}
fclose(f);
FILE *g=fopen("text.out","w");
fprintf(g,"%d",l/cuv);
fclose(g);
return 0;
}