#include<stdio.h>

 int ischar(char c )
 {
	if( ( 65 <= c && c <= 90  )  || ( 97 <= c && c <= 122  ) )
		return 1;
        else  return 0;

 }

int main()
{
char sf,ch,chant=32;
long lglobal=0, num=0, media;
freopen("text.in","r",stdin);
freopen("text.out","w",stdout);
sf=scanf("%c",&ch);
while(sf!=EOF)
{

if( ischar(ch) )
	if ( ischar(chant) )
	{
		lglobal++;
        }
	else
	{
		num++;
		lglobal++;
	}
chant = ch;
sf=scanf("%c",&ch);

}


media = lglobal / num;

printf("%ld",  media);
fcloseall();
return 0;
}