#include <fstream>
#include <string>
using namespace std;
ifstream cin("text.in");
ofstream cout("text.out");
int n,i,j,x,l,sol,lg;
char c;
int main()
{

    while(cin.get(c))
    {
        if((c>='a' && c<='z') || (c>='A' && c<='Z'))
            {
                ++sol;
                while((c>='a' && c<='z') || (c>='A' && c<='Z'))
                    cin.get(c), ++lg;
            }
    }
    //cout<<lg<<" "<<sol<<"\n";
    cout<<lg/sol;
    return 0;
}