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