#include <fstream>
#include <cstring>
using namespace std;

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

char v[10000001];
int a, l, n;

int main()
{
    in.getline(v, 10000000, EOF);
    n=strlen(v);
    for (int i=0; i<n; ++i)
        if (isupper(v[i])||islower(v[i]))
        {
            a++;
            while (isupper(v[i])||islower(v[i]))
            {
                i++;
                l++;
            }
        }
    out<<l/a;
    in.close();
    out.close();
    return 0;
}