#include <cstdio>
#include <vector>

using namespace std;

vector<vector<int>> Graph;
vector<bool> used;

void DFS(int k)
{
  printf("%d ", k + 1);
  used[k] = true;
  for (auto it : Graph[k])
    if (!used[it])
      DFS(it);  
}

int main()
{
  freopen("sortaret.in", "r", stdin);
  freopen("sortaret.out", "w", stdout);

  int N, M;
  scanf("%d%d", &N, &M);
  Graph.resize(N);
  used.resize(N);
  for (int i = 0; i < M; ++i) {
    int a, b;
    scanf("%d%d", &a, &b);
    --a;
    --b;
    Graph[a].emplace_back(b);
  }

  DFS(0);
  
  return 0;
}