#include <bits/stdc++.h>

using namespace std;

ifstream fin("sortaret.in");
ofstream fout("sortaret.out");

int n,m,x,y;
bool vis[50005];
vector <int> g[50005],sol;

void dfs(int u)
{
    sol.push_back(u);
    vis[u]=1;
    for(auto v:g[u])
        if(vis[v]==0)
            dfs(v);
}

int main()
{
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        fin>>x>>y;
        g[x].push_back(y);
    }
    dfs(1);
    for(int x:sol)
        fout<<x<<" ";
    fout<<"\n";
    return 0;
}