#include <fstream>
#define IN "text.in"
#define OUT "text.out"

using namespace std;

ifstream in(IN);
ofstream out(OUT);

char c;
int nlit, ncuv;
bool init;

int main()
{
	while(in.get(c))
	{
		
		if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
			++nlit,
			init=1;
		else if(init)
			++ncuv,
			init=0;
	}
	out<<nlit/ncuv<<'\n';
	in.close();
	out.close();
	return 0;
}