#include <fstream>

using namespace std;

int main()
{
   char s;
   int nr,nr1,i;
   ifstream fin("text.in");
   ofstream fout("text.out");
    nr=0;
    nr1=0;
    while(fin.get(s))
    {
        if(s==' ' || s=='-')
        nr++;
        if(s>='A' && s<='Z' || s>='a' && s<='z' )
            nr1++;

    }
    fout<<nr1/nr;

    return 0;
}