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#include <bits/stdc++.h>
using namespace std;
ifstream fin("ciclueuler.in");
ofstream fout("ciclueuler.out");
int n, m, x, y;
int a[10002][10002];
stack<int> r;
static inline void euler(int nod) {
for(int i = 1; i <= n; i++) {
if(a[nod][i]) {
a[nod][i]--;
a[i][nod]--;
euler(i);
}
}
r.push(nod);
}
int main() {
fin >> n >> m;
while(m--) {
fin >> x >> y;
a[x][y]++;
a[y][x]++;
}
euler(1);
while(r.size() > 1) {
fout << r.top() << " ";
r.pop();
}
return 0;
}