#include<fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s[2000000];
int c1,c2,i,ok;
int main()
{
    fin.get(s,2000000,'\n');
    fin.get();
    for(i=0;s[i]!=0;i++)
    {
        ok=0;
        if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z'))
        {
            c1++;
            ok=1;
        }
        if(!((s[i+1]>='a' && s[i+1]<='z') || (s[i+1]>='A' && s[i+1]<='Z')) && ok==1)
        {
            c2++;
        }
    }
    fout<<c1/c2;
    fin.close();
    fout.close();
    return 0;
}