#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
long long suma,cuv;
bool e;
int n;
char a[3000010];
int main()
{
    while(fin){
        e=0;
        fin.get(a,3000010);
        n=strlen(a);
        for(int a1=1;a1<=n;a1++){
        if((a[a1]>='a' and a[a1]<='z') or (a[a1]>='A' and a[a1]<='Z'))
        {
            suma++;
            if(e==0)
            {
                cuv++;
                e=1;
            }
        }
        else e=0;
        }
    }
    fout<<suma/cuv;
}