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

using namespace std;

ifstream f("text.in");
ofstream g("text.out");
char c[40];
int nrcuv,nrlitere;
int main()
{
    while(f.get(c,260,' ')) {
        for(int i=0;i<strlen(c);i++) {
            if( (c[i]>='a' && c[i]<='z') || (c[i]>='A' && c[i]<='Z') )
                nrlitere++;
            if(c[i]=='-' && ((c[i+1]>='a' && c[i+1]<='z') || (c[i+1]>='A' && c[i+1]<='Z')))
                nrcuv++;
        }
        nrcuv++;
        f.get();
    }
    g<<nrlitere/nrcuv;
    return 0;
}