#include<fstream>
#include<string>
using namespace std;
ifstream in ("text.in");
int main (){
    string s;
    int a=0,b=0;
    ofstream out ("text.out");
    while(in.eof()){
        in>>s;
        b++;
        a+=s.size();
    }
    a=a/b;
    out<<a<<" ";
    return 0;
}