#include<stdio.h>
FILE *in=fopen("text.in","r");
FILE *out=fopen("text.out","w");
char c,a;
int nr,cuv,ok;
int main()
{
	a='`';
	fscanf(in,"%c",&c);
	while(a!=c)
	{
		ok=0;
		while(c!=' ')
		{
			a=c;
			if((c<='z'&&c>='a')||(c>='A'&&c<='Z'))
				ok=1,nr++;
			fscanf(in,"%c",&c);
		}
		if(ok==1) cuv++;
		fscanf(in,"%c",&c);
	}
	fprintf(out,"%d",nr/cuv);
	return 0;
}