#include<fstream>
#include<cstring>
#include<cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int a[20][20],v[25],i,j,x,n,m,k,ok,oo,pp,qq;
long long maxim,ss,minim;
char s[1000001],p1,p2,p3;
int main(){
    fin.get(s, 300);
    n=strlen(s);
    for(i=1;i<n;i++){
        if(s[i]>='a'&&s[i]<='z'&&s[i-1]==' ')
            k++;
        if(s[i]>='a'&&s[i]<='z'&&s[i-1]=='-')
            k++;
        if(s[i]>='A'&&s[i]<='Z'&&s[i-1]==' ')
            k++;
        if(s[i]>='A'&&s[i]<='Z'&&s[i-1]=='-')
            k++;
        if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')
            oo++;
    }
    fout<<oo/k;
    return 0;
}