#include<iostream>
#include<stdio.h>

using namespace std;

int main()
{
	FILE *f=fopen("text.in","r");
	FILE *g=fopen("text.out","w");
	int cuv=0;
	int cif=0;
	char c,d;
	fread(&c,1,1,f);
	while(!feof(f))
	{
		fread(&d,1,1,f);
		
		cuv+=(( (( c>='a' && c<='z' ) || ( c>='A' && c<='Z' )) && (!(( d>='a' && d<='z' ) || ( d>='A' && d<='Z' ))) )==1);
		if((c>='a'&&c<='z')||(c>='A'&&c<='Z')) cif++;
		c=d;
	}
	fprintf(g,"%d",cif/cuv);
	getch();
	fclose(f);
	fclose(g);
	return 0;
}