import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] d = new int[n + 1];
        int cnt = 0;

        List<Integer> res = new ArrayList<>();
        List<List<Integer>> g = new ArrayList<>();
        for(int i = 0; i <= n; i ++ ) g.add(new ArrayList<>());

        for(int i = 1; i <= m; i ++ ){
            int a = sc.nextInt();
            int b = sc.nextInt();
            g.get(a).add(b);
            d[b] ++ ;
        }

        Deque<Integer> q = new LinkedList<>();
        for(int i = 1; i <= n; i ++ )
            if(d[i] == 0) q.offer(i);

        while(q.size() != 0){
            int t = q.poll();
            cnt ++ ;
            res.add(t);
            for(int e: g.get(t)){
                if(-- d[e] == 0) q.offer(e);
            }
        }

        if(cnt == n){
            res.forEach(item -> System.out.print(item + " "));
        } else System.out.println(-1);
    }
}