#include<stdio.h>
char a,b;
int x=0,y=0;;
FILE *in,*out;
int main()
{
	in=fopen("text.in","r");
	a=getc(in);
	if(a!=EOF)
	while((b=getc(in))!=EOF)
	{
		if(((a>='a'&&a<='z')||(a>='A'&&a<='Z'))&&!((b>='a'&&b<='z')||(b>='A'&&b<='Z'))) x++;
		if((a>='a'&&a<='z')||(a>='A'&&a<='Z')) y++;
	    a=b;
	}	
	fclose(in);
    out=fopen("text.out","w");
	if(x==0) x++;
    fprintf(out,"%ld",y/x);
    fclose(out);
}