#include<fstream>
#define Fin "text.in"
#define Fout "text.out"
using namespace std;
ifstream in (Fin);
ofstream out (Fout);
int litera(char c)
{
	if('a'<=c&&c<='z'||'A'<=c&&c<='Z') return 1;
	return 0;
}
int main()
{
	char c1=' ',c2;
	int cuv=0,ch=0;
	while(!in.eof())
	{
		in>>c2;
		if(litera(c2))
		{
			ch++;
			if(!litera(c1)) cuv++;
		}
		c1=c2;
	}
	out<<ch/cuv;
	return 0;
}