#include <iostream>
#include <fstream>

using namespace std;

int lung,nrcuv;
char c,litm;

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    while(f.get(c))
    {
        if((c>='a' && c<='z') || (c>='A' && c<='Z'))
            lung++;
        else
            if((litm>='a' && litm<='z') || (litm>='A' && litm<='Z'))
                nrcuv++;
        litm=c;
    }
    g<<lung/nrcuv;
    f.close();
    g.close();
    return 0;
}