#include <fstream>
#include <cstring>

using namespace std;

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

char x[100003];
int i, lg, nrlit, nrcuv, litcr;
bool ok;

int main()
{
    f.getline(x, sizeof(x));
    lg = strlen(x) - 1;
    for(i = 0; i <= lg; i++){
        ok = false;
        if (('a' <= x[i] && x[i] <= 'z') || ('A' <= x[i] && x[i] <= 'Z'))
            nrlit++, litcr++;
        else
            ok = true;
        if (ok == true && litcr)
            nrcuv++, litcr = 0;
    }
    g << nrlit/nrcuv;
    return 0;
}