#include <fstream>
using namespace std;

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

int main()
{
    char x;
    char c[10001];
    int cnt = 0;
    int cnt2 = 0;
    int cnt3 = 0;
    while ( is.get(x))
    {
        if ( x == NULL)
        break;
        if ( ((int)x >= 65 && (int)x <= 90) || ((int)x >= 97 && (int)x <= 122)  )
        {
            cnt++;
            cnt2++;
        }
        else
        {
            if ( cnt >= 1)
            cnt3++;
            cnt = 0;
        }
    }
    os << cnt2/cnt3;
    return 0;
}