#include<fstream.h>
#include<string.h>
    int litera(char a){
		if((a>='a' && a<='z') || (a>='A' && a<='Z')) return 1;
		return 0;
	}
	char a[1000001];
	int i,l,lit,cuv;
    int main(){
		ifstream f("text.in");
		ofstream g("text.out");
		f.get(a,1000000);
		l=strlen(a);
		i=0;
		while(i<l){
			if(litera(a[i])){
				cuv++;
				while(litera(a[i])){
					lit++;
					i++;
				}
			}
			i++;
		}
		//g<<lit<<" "<<cuv<<"\n";
		g<<lit/cuv;
		g<<"\n";
		g.close();
		return 0;
	}