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

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

char c[30000];
int lit, cuv;

int main(){
    while (cin >> c){
        int nr = strlen(c);
        bool ok = 1;
        for (int i = 0; i <= nr-1;++i){
            if ((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z'))
            {
                lit++;
                if (ok == 1)
                {
                    cuv++;
                    ok = 0;
                }
            }
                else
                    ok = 1;
            
        }
    } 
    cout << lit/cuv;
}