sim 5/11/2021

1.
	8820
2.
	2, 4
3.
#include <iostream>
using namespace std;

int main() {
    int n, x, m, p;
    cin >> n;
    x = 0, m = 0, p = 1;
    while (x < 10) {
        int cn = n;
        while (cn != 0) {
            int c = cn % 10;
            cn /= 10;
            if (c == x) {
                m = c * p + m;
                p *= 10;
            }
        }
        x += 2;
    }
    cout << m << endl;
    return 0;
}
4.
...
	repeta
		...
	pana cand cn = 0
...