#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

int l, nrcuv, ltotala;
char ch;

int main(){
    while(fin.get(ch)){
        if( (ch>='a'&&ch<='z') || (ch>='A'&&ch<='Z') ){
            l++;
            ltotala++;
        }else{
            if(l>0){
                nrcuv++;
            }
        }
    }
    fout<<ltotala/nrcuv;
}