sb3 3 bac2020 t19

#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("bac.txt");

int main() {
    int a = -1, b;
    while (fin >> b) {
        if (a != b && b % 2 == 0) {
            cout << b << ' ';
        }
        a = b;
    }
    return 0;
}