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

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

char v[1000010];

int main()
{
    char c,l=0;
    int t=0,nr=0,i=0,n;
    f.read(v,1000000);
    n=strlen(v);
    for (i=0;i<=n;i++){
        if ((v[i]<='z'&&v[i]>='a')||(v[i]<='Z'&&v[i]>='A')){
            t++;
        }
        else if ((l<='z'&&l>='a')||(l<='Z'&&l>='A')) nr++;
        l=v[i];
    }
    g<<t/nr;
    f.close();
    g.close();
    return 0;
}