#include <stdio.h>
#include <ctype.h>
int s=0, c;
bool sw;
char x;
int main()
{
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);

while(scanf("%c", &x)!= EOF)
 {
   sw=1;
   while (!isalpha(x)&&! feof(stdin))
    x=fgetc(stdin);//scanf("%c", &x);
   while (isalpha(x)&&! feof(stdin))
    {
      sw=0;
     s++;
      x=fgetc(stdin);//scanf("%c", &x);
      }
   if (sw==0)
    c++;
   }
printf("%d", s/c);
return 0;
}