#include<fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
	int nrcuv=0,nrlit=0,i=0,x,lung;
	char v[2000001];
	f.getline(v,2000000,'\0');
	f.close();
	lung=strlen(v);
	while(i<=lung)
	{
		x=0;
		while(((v[i]>='a')&&(v[i]<='z'))||((v[i]>='A')&&(v[i]<='Z'))) {x++;nrlit++;i++;}
		if(x>0) {nrcuv++;}
		i++;
	}
	g<<nrlit/nrcuv;
	g.close();
	return 0;
}