//http//infoarena.ro/problema/text

#include<string.h>
#include<stdio.h>
int main()
{
FILE *f;
f=fopen("text.in","r");
freopen("text.out","w",stdout);
int l,i,cuv=0,car=0;
char s,c=' ';
while(fscanf(f,"%c",&s)!=EOF){
	if(s>='a'&&s<='z'||s>='A'&&s<='Z'){car++;
	if(!(c>='a'&&c<='z'||c>='A'&&c<='Z'))cuv++;
	}
	c=s;
	}
printf("%d",car/cuv);
return 0;

}