#include <fstream>

using namespace std;

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    char c[100];
    int cuv=0;
    long long nrl=0,nrc=0;
    while(in.get(c,2))
    {
       if(c[0]>='A'&&c[0]<='Z'||c[0]>='a'&&c[0]<='z')
        {
            nrl++;
            if(!cuv)
            {
                cuv=1;
                nrc++;

            }
        }
        else cuv=0;
    }

    out<<nrl/nrc;
    return 0;
}