#include <bits/stdc++.h>
#define Dim 50009
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
int N,M,x,y,Post[Dim],cnt;
bool viz[Dim];
vector < int > Vf[Dim];

void Citire()
{
    f>>N>>M;
    for(int i=1;i<=M;i++)
    {
        f>>x>>y;
        Vf[x].push_back(y);
        Vf[y].push_back(x);
    }
}

void DFS(int nod)
{
    for(unsigned int i=0;i<Vf[nod].size();i++)
    if(!viz[Vf[nod][i]])
    {
        viz[Vf[nod][i]]=1;
        DFS(Vf[nod][i]);
    }
    Post[++cnt]=nod;
}

int main()
{
    Citire();
    for(int i=1;i<=N;i++)
    if(!viz[i])
    {
        viz[i]=1;
        DFS(i);
    }
    for(int i=cnt;i>=1;i--) g<<Post[i]<<" ";
    return 0;
}