#include<fstream>
using namespace std;
int main()
{
	ifstream f("text.in");
	ofstream g("text.out");
	char a[1000000];
	long i,nr=0,n=0;
	f.get(a,1000000);
	for(i=0; i<strlen(a); i++)
	{
		if((a[i]>='a' && a[i]<='z' )|| (a[i]>='A' && a[i]<='Z'))
		{
			nr++;
		if(!(a[i+1]>='a' && a[i+1]<='z') && !( a[i+1]>='A' && a[i+1]<='Z'))
			n++;
		}
	}
			
	if((a[strlen(a)-1]>='a' && a[strlen(a)-1]<='z' )|| (a[strlen(a)-1]>='A' && a[strlen(a)-1]<='Z'))
		nr++;
		g<<nr/n;
}