#include<iostream>
#include<fstream>
#include<string.h>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");
char s[255];
int lit=0;
int cuv=0;

int main(){
    
    while (fin>>s){
        int nr=strlen(s);
        bool ok=1;
        for (int i=0;i<=nr-1;++i){
            if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
            {
                lit++;
                if(ok==1){
                    cuv++;
                    ok=0;
                }
            }
                else ok=1;
        }
    } 
    fout <<lit/cuv;
    fin.close();
    fout.close();
    return 0;
}