#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
//#include <fstream.h>

int main(){
	FILE *fin=fopen("text.in","r");
	char a;
	int caractere=0;
	int cuvinte=0;
	int a_fost_litera=0;
	do{
		fscanf(fin,"%c",&a);

		if(isalpha(a)){
			caractere++;
			if(!a_fost_litera){
				cuvinte++;
				a_fost_litera=1;
			}
		}
		else
			a_fost_litera=0;
	}while(!feof(fin));
	FILE *fout=fopen("text.out","w");
	fprintf(fout,"%d\n",caractere/cuvinte);
	return 0;
}