#include<fstream>
#include <string>
#include<algorithm>
using namespace std;
string a;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    int i,p=1,c=0,q;
    getline(f,a);
    for(i=0;i<a.size();++i)
    {
        q=1;
        if((a[i]>='a' && a[i]<='z')||(a[i]>='A' && a[i]<='Z'))
                q=0,c++;
        if(q==1){
                ++p;
                if(!((a[i+1]>='a' && a[i+1]<='z')||(a[i+1]>='A' && a[i+1]<='Z')))
                 --p;
                 if(!((a[i+1]>='a' && a[i+1]<='z')||(a[i+1]>='A' && a[i+1]<='Z')) && i==a.size()-1)
                    ++c;
    }
    }
g<<c/p;
}