#include <fstream>
#include <algorithm>
#include <string>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int i,k,z,n;
string s;
int main()
{
	while(f>>s){
		n=s.length();
		
		for(i=0;i<=n;++i){
			if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) ++z; 
			if(((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) && !((s[i+1]>='a' && s[i+1]<='z') || (s[i+1]>='A' && s[i+1]<='Z')))++k;
		}
	}
	g<<z/k;
	
	return 0;
}