#include <fstream>
#include <string.h>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int main()
{
    char a;
    unsigned long long sp=0,cuv=1;
    while(cin.get(a))
    {
        if((a==' '||a=='-')&&sp) ++cuv;
        else if(isalpha(a)) ++sp;
    }
    cout<<sp/cuv;
    return 0;
}