#include <fstream>
#include <string.h>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");
char c,ul;
int nrcuv,nrlitere;
int litera (char c)
{
    if((c>='a' && c<='z') || (c>='A' && c<='z'))
        return 1;
    return 0;
}
int main()
{
    while(f>> noskipws >>c) {
        if(litera(c)==1)
            nrlitere++;
        if(litera(c)==0 && litera(ul)==1)
            nrcuv++;
        ul=c;
    }
    g<<nrlitere/nrcuv;
    return 0;
}