#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
char c[1100005];
int lit,medie,cuv,nr;
bool ok;
int main()
{
    while(cin>>c)
    {
        nr=strlen(c);
        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;
    return 0;
}