#include<fstream>
#include<string.h>
#define Max 15000
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int Lit, Cuv;
int main(){
    char s[Max];
    int i=0;
    fin.getline(s,Max);
    while(i<strlen(s)){
        if(s[i]>='a' and s[i]<='z' or s[i]>='A' and s[i]<='Z')
            Lit++;
        i++;
    }
    i=0;
    while(i<strlen(s)){
        if(s[i]>='a' and s[i]<='z' or s[i]>='A' and s[i]<='Z' or s[i]=='-'){
            Cuv++;
            while(s[i]>='a' and s[i]<='z' or s[i]>='A' and s[i]<='Z' or s[i]=='-')
                i++;
        }
        else i++;
    }
    int Medie;
    Medie = Lit/Cuv;
    fout<< Medie;
}