#include<fstream>
#include<string.h>
using namespace std;
char b[1500000],*p;
int n,x,i,c;
int main()
{
     ifstream fin("text.in");
    ofstream fout("text.out");
    fin.get(b,1500000,'\n');
    fin.get();
    n=strlen(b);
    b[n]=' ';
    b[n+1]=0;
    n++;
    x=n;
    c=0;
    for(i=0;i<n;i++)
    {
        if(b[i]<'A' || (b[i]>'Z' && b[i]<'a') || b[i]>'z')
        {
            b[i]=' ';
            x--;
        }
        else
        {
            if(b[i]>='A' && b[i]<='Z')
            {
                b[i]=b[i]+32;
            }
        }
        if(b[i]==' '&& b[i-1]>='a' && b[i-1]<='z')
        {
            c++;
        }
    }
    //c=0;
    /*
    p=strtok(b," ");
    while(p!=0)
    {
        c++;
        p=strtok(0," ");
    }
    */
    fout<<x/c;
    fin.close();
    fout.close();
    return 0;
}