#include<fstream>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
char c[2000000],x,n;
int rez,k;
int main(){
	while(cin.get(x)){
		c[n] = x;
		n++;
	}

	int i = 0;
	while(!((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&& i <n)i++;
	while(i < n){
		while(((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&& i <n){

			i++;
			rez++;
		}

		k++;
		while(!((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))&& i <n)i++;
	}
	if(k == 0)cout <<"0";
	else cout <<rez/k;
}