#include<iostream>
#include<fstream>
using namespace std;

bool eLitera(char c){
	char listere[] = "qwertyuiopasdfghjklzxcvbnm";
	for (int i = 0; i < 26; i++){
		if (c == listere[i]){
			return true;
		}
	}
	return false;
}

int main(){
	ifstream f("text.in");
	char c = NULL;
	f >> c;
	int cuvinte=0;
	int litere = 0;
	bool eCuvant;
	char bk = c;
	while (c != NULL){
		bk = c;
		if (eLitera(c)){
			litere++;
		}
		else{
			cuvinte++;
		}
		f >> c;
		if (c == bk)break;
	}
	ofstream o("text.out");
	o << litere / cuvinte;
	return 0;
}