#include<stdio.h>
FILE *in,*out;
char ci;
int nr_lit, nr_cuv;
bool ok=false;
int main()
{
	in=fopen("text.in","rt");
	out=fopen("text.out","wt");
	while(!feof(in))
	{
		fscanf(in,"%c",&ci);
		if( (ci>=65 && ci<=90) || (ci>=97 && ci<=122) )
		{
			ok=true;
			nr_lit++;
		}
		else
		{
			if(ok)
			{
				nr_cuv++;
				ok=false;
			}
		}
		
		
	}
	if(nr_cuv)
		fprintf(out,"%d",nr_lit/nr_cuv);
	else
		fprintf(out,"0");
		
	return 0;
}