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#include <bits/stdc++.h>
#include <fstream>
#define MAX 50100
using namespace std;
ifstream f("sortaret.in");
ofstream g("sortaret.out");
int n,m,x[5000][5000],viz[MAX];
void cit(){
f>>n>>m;
int a,b;
for(int i=1;i<=m;i++){
f>>a>>b;
x[a][b]=1;
x[b][a]=1;
}
}
/*void afis(){
for(int i=1; i<=n; i++){
for(int j=1;j<=n;j++)
g<<x[i][j]<<" ";
g<<'\n';
}
}
*/
void df(int i){
g<<i<<" ";
viz[i]=1;
for(int j=1;j<=n;j++)
if(x[i][j]==1&&!viz[j])
df(j);
}
int main()
{
cit();
df(1);
//afis();
return 0;
}