#include<fstream>
using namespace std;
fstream f("text.in", ios::in),
		g("text.out", ios::out);
long long n, nrlit, cuv, i;
char litera[53]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ", a[5000000];
int main()
{
	f.getline(a, 5000000);
	n=strlen(a);
	nrlit=0;cuv=0;
	for(i=0; i<=n-1; i++)
	{
		if(strchr(litera, a[i])!=0)
			nrlit++;
	}
	for(i=0; i<=n-1; i++)
	{
		if(strchr(litera, a[i])!=0)
		{
			cuv++;
			while(strchr(litera, a[i])!=0)
				i++;
		}
	}
	g<<nrlit/cuv;
}