#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[100001];
int i,cntl=0,cntc=0,n;
int main()
{
f.get(s,100001,'\n');
n=strlen(s);
for(i=0;i<n;i++){
    if((s[i]>='a'&&s[i]<='z') || (s[i]>='A'&&s[i]<='Z') ) cntl++;
    if((s[i]==' '&&((s[i+1]>'a'&&s[i+1]<'z') || (s[i+1]>'A'&&s[i+1]<'Z'))) || (s[i]=='-'&&(s[i]>='a'&&s[i]<='z') || (s[i]>='A'&&s[i]<='Z'))) cntc++;
}

g<<cntl/cntc;
return 0;}