C++ :

#include <iostream>
using namespace std;
int main() {
    char str[101];
    cin >> str;
    for (int i = 0; str[i] != '\0'; ++i) {
        if (str[i] % 2 == 0) {
            cout << str[i];
        }
    }
    cout << endl;
    return 0;
}