#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");

char c;
int cuv, lit;
bool k;

bool litera(char c)
{
    return ((c>='a' && c<='z') || (c>='A' && c<='Z'));
}
int main()
{
    while(cin.get(c))
    {
        if(litera(c))
        {
            lit++;
            k=1;
        }
        else
        if(k)
        {
            cuv++;
            k=0;
        }
    }
    cout<<lit/cuv;
    return 0;
}