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

char C, Prev = '.';
int N, W;

int main()
{
    ifstream cin("text.in");
    ofstream cout("text.out");

    while(cin.get(C))
    {
        if(islower(C) || isupper(C)) N ++;
        if((islower(C) || isupper(C)) && !islower(Prev) && !isupper(Prev)) W ++;
        Prev = C;
    }

    cout << N / W;
    return 0;
}