#include <bits/stdc++.h>
using namespace std;
ifstream fin("sortaret.in");
ofstream fout("sortaret.out");
int n,m,t[50005],cnt;
vector<int>L[50005];
bool viz[50005];
void Citire()
{
    int x,y;
    fin>>n>>m;
    for(int i=1;i<=m;i++)
        fin>>x>>y,
        L[x].push_back(y),
        L[y].push_back(x);
}
void Dfs(int k)
{
    int i;
    viz[k]=1;
    for(i=0;i<L[k].size();i++)
        if(!viz[L[k][i]])
            Dfs(L[k][i]);
    t[++cnt]=k;
}
int main()
{
    Citire();
    for(int i=1;i<=n;i++)
        if(!viz[i])
            Dfs(i);
    for(int i=cnt;i>=1;i--)
        fout<<t[i]<<" ";

    return 0;
}