#include <iostream>
#include <fstream>
using namespace std;
int c,d=1,j,i,n;
char a;
string s;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    i=0;
    while((a<65) or (a<97 and a>90) or (a>122))
       {f>>a;i++;}
    c++;
    getline(f,s);
    n=s.length();
    for(i=0;i<=n-1;i++)
    {
        if(s[i]==' ' or s[i]=='-') d++;
        if ((s[i]>=65 and s[i]<=90) or (s[i]>=97 and s[i]<=122)) c++;
    }
    cout<<c/d;

    return 0;
}