#include <fstream>
#include<cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[10001];
int i,n,nr,cnt=0;
int verificare(char c)
{
    if(c>='a'&&c<='z'||c>='A'&&c<='Z')
        return true;
}
int main()
{
    f.getline(s,sizeof(s));
    n=strlen(s);
    for(i=0;i<=n;i++)
   if(verificare(s[i])==1)
    nr++;
    while(verificare(s[i])==true)
       {
     nr++;
     i++;
       }
       for(i=0;i<=n;i++)
       if(s[i]==' '||s[i]=='-'&&verificare(s[i-1]==true)&&verificare(s[i+1]==true))
        cnt++;
   g<<nr/cnt;
    return 0;
}