#include <fstream>
#include <cstring>
 
using namespace std;
 
ifstream in("text.in");
ofstream out("text.out");
 
long c, l;
 
int main()
{
    char x;
    bool cuv_nou = false;
    while(in.get(x))
    {
        if(x>='A' && x<='z')
        {
            l++;
            if(!cuv_nou)
            cuv_nou = true, c++;
        }
        else cuv_nou = false;
    }
    out << l/c;
    return 0;
}