#include<fstream>
#include<cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int n,i,nrc,nrl;
char a[999999999];

int main ()
{
    f.get(a,999999999);
    n=strlen(a);
    i=0;
    while(i<n)
    {
        if((a[i]>='A'&&a[i]<='Z')||(a[i]>='a'&&a[i]<='z'))
        {
            while((a[i]>='A'&&a[i]<='Z')||(a[i]>='a'&&a[i]<='z'))
            {
                nrl++;
                i++;
            }
            nrc++;
        }
        i++;
    }
    g<<nrl/nrc;
    return 0;
}