#include <fstream>
#include <string>

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

int n,nr,nc,i,s;

string c;

int main()
{
    getline(fin, c);
    i=0;
    while (c[i]>=0 && c[i]<127)
    {
        if ((c[i]>='A' && c[i]<='Z') || (c[i]>='a' && c[i]<='z')) nr++;
        else
        {
            s=s+nr;
            if (nr!=0) nc++;
            nr=0;
        }
        i++;
    }
    fout << s/nc;

    return 0;
}