#include<fstream>
#include<string>
using namespace std;
char v[100000];
int k,l,n,lg;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
	in.get(v,100000);
	int i;
	i=0;
	k=0;
	while(v[i]!='\0')
	{
		if(!isalpha(v[i]))
			if(k==1)
			{
				k=0;
				n++;
			}
		if(isalpha(v[i]))
		{
			k=1;
			l++;
		}
		i++;
	}
	in.close();
	out<<l/n;
	out.close();
}