bac2k21 sb3 3

#include <iostream>
using namespace std;

int main() {
    freopen("bac.txt", "r", stdin);
    int x, a, b, ans1 = -1, ans2 = -1;
    cin >> x >> a;
    while (cin >> b) {
        if (a % 1000 == x && b % 1000 == x) {
            ans1 = a;
            ans2 = b;
        }
        a = b;
    }
    if (ans1 == -1) {
        cout << "nu exista" << endl;
    } else {
        cout << ans1 << ' ' << ans2 << endl;
    }
    return 0;
}