#include <fstream>
#include <cstring>
using namespace std;
int litere=0,cuvinte=0;
char x[2000000];
void solve()
{
    int n,i;
    ifstream in("text.in");
    in.getline(x,2000000);
    n=strlen(x);
    for (i=0;i<n;++i)
    {
        if (('A'<=x[i]&&x[i]<='Z')||('a'<=x[i]&&x[i]<='z'))
        ++litere;
        else
        if (i>0&&(('A'<=x[i-1]&&x[i-1]<='Z')||('a'<=x[i-1]&&x[i-1]<='z')))
        ++cuvinte;
    }
    if(('A'<=x[n-1]&&x[n-1]<='Z')||('a'<=x[n-1]&&x[n-1]<='z')) ++cuvinte;
    in.close();
}
int main()
{
    solve();
    ofstream out("text.out");
    out<<litere/cuvinte<<'\n';
    out.close();
    return 0;
}