#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

int litera (char s)
{
    if((s>='a' && s<='z') || (s>='A' && s<='Z'))
        return 1;
    return 0;
}
int main()
{
    char x,y;
    int nrcuvinte=0,nrlitere=0;
    while(fin.get(x))
    {
        if(litera(x)==1)
            nrlitere++;
        else
            if(litera(x)==0 && litera(y)==1)
                nrcuvinte++;
        y=x;
    }
    fout<<nrlitere/nrcuvinte;
    return 0;
}