#include <fstream>

using namespace std;

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

char c;
int lg,nr,kk;
bool litera(char ww){
    int ok=0;
    if(ww>='a' && ww<='z') ok=1;
    if(ww>='A' && ww<='Z') ok=1;
    return ok;
}

int main(){
    while(!fin.eof()){
        fin.get(c);
        if(litera(c)){
            lg++;
            if(!kk){
                nr++;
                kk=1;
            }
        }
        else kk=0;
    }
    fout<<lg/nr;
    return 0;
}