9.1.19

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

int main() {
    ifstream in ("f1.txt");
    ofstream out("f2.txt");

    while (in) {
        string line;
        getline(in, line);
        if (line.length() % 2 == 0 && line != "")
            out << line << endl;
    }
    in.close();
    out.close();
}