#include<fstream>

using namespace std;

int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    string s;
    long int c=0,w=0;
    fin>>s;
    if((s[0]>='a'&&s[0]<='z')||(s[0]>='A'&&s[0]<='Z'))
    {
        c++;
        w++;
    }
    for(int i=1;i<s.length();i++)
    {
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
        {
            c++;
            if(s[i]<'A'||(s[i]>'Z'&&s[i]<'a')||s[i]>'z')
            {
                w++;
            }
        }
    }
    fout<<c/w;
}