#include<fstream>
#include<cstdio>
using namespace std;
char x;
int nr,sp,med;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    x=f.get();
    while(!f.eof())
        {
                if((x>='A'&&x<='Z')||(x>='a'&&x<='z'))
                nr++;
                else
                if(x==' '||x=='-'||x=='('||x==')')
                sp++;
                x=f.get();
        }
    med=nr/sp;
    g<<med;
    return 0;
}