#include <fstream>
#include <cstring>

using namespace std;

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

const int N = 100006;
char c;
long long i, k, l, kc, cuv;
int main()
{
    while (F.get(c))
        {
            if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
                k ++, cuv ++;
            else
                if (cuv > 0)
                    cuv = 0, kc++;
        }
    /*if (cuv > 0)
        kc ++;*/
    if (kc)
        G << k / kc;
    else
        G << kc;
    return 0;
}