#include<cstring>
#include<fstream>
using namespace std;
int l,n;
char a,b;
int main(){
    ifstream in("text.in"); ofstream out("text.out");
    a=' ';
    while(!in.eof()){
        //in>>b;
        in.get(b);
        if((b>='a' && b<='z') || (b>='A' && b<='Z')){
            l++;
            if( !((a>='a' && a<='z') || (a>='A' && a<='Z'))) ++n;
        }
        a=b;
    }
    out<<l/n<<'\n';
}
//- Lasa-ma in pace, ca am invatat azi noapte toata ziua!
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