#include<stdio.h>
#include<ctype.h>
FILE *f=fopen("text.in","r"),*g=fopen("text.out","w");
char b[10001],a;
int main()
{
int j=-1,i=0,lm=0,cv=0;
fgets(b,10000,f);
for(;;)
{
 j++;
 a=b[j];
 if(isalpha(a))i++;
 else
 {
  if(i>0){lm=lm+i;cv++;i=0;}
 }
 if(a=='\x0')break;
}
fprintf(g,"%d",lm/cv);
return 0;
}