1 #include<algorithm>
 2 #include<iostream>
 3 #include<cstdlib>
 4 #include<cstring>
 5 #include<cstdio>
 6 #include<vector>
 7 #include<map>
 8 #include<set>
 9 using std::cin;
10 using std::cout;
11 using std::endl;
12 using std::find;
13 using std::sort;
14 using std::set;
15 using std::map;
16 using std::pair;
17 using std::vector;
18 #define sz(c) (int)(c).size()
19 #define all(c) (c).begin(), (c).end()
20 #define iter(c) decltype((c).begin())
21 #define cls(arr,val) memset(arr,val,sizeof(arr))
22 #define cpresent(c, e) (find(all(c), (e)) != (c).end())
23 #define rep(i, n) for (int i = 0; i < (int)(n); i++)
24 #define tr(c, i) for (iter(c) i = (c).begin(); i != (c).end(); ++i)
25 #define pb(e) push_back(e)
26 #define mp(a, b) make_pair(a, b)
27 const int Max_N = 100010;
28 typedef unsigned long long ull;
29 set<int> res;
30 int main() {
31 #ifdef LOCAL
32     freopen("in.txt", "r", stdin);
33     freopen("out.txt", "w+", stdout);
34 #endif
35     int n, m, v;
36     while (~scanf("%d %d", &n, &m)) {
37         rep(i, n + m) scanf("%d", &v), res.insert(v);
38         iter(res) it = res.begin();
39         printf("%d", *it++);
40         for (; it != res.end(); ++it) printf(" %d", *it);
41         putchar(‘\n‘);
42         res.clear();
43     }
44     return 0;
45 }