#include <fstream>

using namespace std;

bool eLitera(char c) {
    return ((c>='a'&&c<='z')||(c>='A'&&c<='Z'));
}

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    char preced='*',curent;
    int l=0,n=0;
    while(fin>>noskipws>>curent) {
        if(eLitera(curent))
            l++;
        else if(eLitera(preced))
            n++;
        preced=curent;
    }
    fout<<l/n;
    return 0;
}