using namespace std;
#include<fstream>

ifstream in ("text.in");
ofstream out ("text.out");

int main(){
    char v;
    int lit=0,cuv=0,trecut=1,i=0;
    while(in.get(v)){
        if(('a'<=v && v<='z') || ('A'<=v && v<='Z')){
            lit++;
            trecut=0;
        }
        else if(trecut=0){
            cuv++;
            trecut=1;
        }
        i++;

    }
    if(trecut==0)
        cuv++;
    out<<lit/cuv;
    out.close();
    return 0;
}