#include<cstdio>
#include<fstream>
using namespace std;
char c;
int lg,k;
int main()
{
    fstream f("text.in",ios::in);
    freopen("text.out","w",stdout);
    int ant=0,p=0;
    while(f.get(c))
    {
       if( (c>='a' && c<='z') || (c>='A' && c<='Z') ) p++;
       else
       {
           if(p) ++k;
           lg+=p;
           p=0;
        }
    }
    printf("%d\n",lg/k);
    return 0;
}