#include <fstream>
#include <string>
using namespace std;

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

int txt(string s)
{
    int n=0,c=0,k=0;
    s.push_back(' ');
    for (int i=0;i<s.size();i++)
    {
        if (s[i]>=97 && s[i]<=122 || s[i]>=65 && s[i]<=90)
        {
            n++;
            if (s[i+1]<65 || s[i+1]>122 || s[i+1]>90 && s[i+1]<97 )
            {
                k++;
            }
        }
    }
    return n/k;
}

main()
{
    string s;
    getline(in,s);
    out<<txt(s);
}