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

int main(){
	int cuv=0,n=0,nr=0,lit=0;
	string nc;
	char *v;
	ifstream in("text.in");
	ofstream out("text.out");
	while(cin>>v){
		nr++;
		if((v[nr]>='A' && v[nr]<='Z') || (v[nr]>='a'  && v[nr]<='z')){
			lit++;
		}
		else if((v[nr]<='A' && v[nr]>='Z') || (v[nr]<='a'  && v[nr]>='z'))
			cuv++;
	}
	out<<lit/cuv;
	
	return 0;
}