diff --git a/swea/5431.py b/swea/5431.py
new file mode 100644
index 0000000..7e6c528
--- /dev/null
+++ b/swea/5431.py
@@ -0,0 +1,9 @@
+t=int(input())
+for tc in range(1,t+1):
+    n,k=map(int,input().split())
+    sm=set(map(int,input().split()))
+    nsm=[]
+    for i in range(1,n+1):
+        if not i in sm:
+            nsm.append(i)
+    print("#"+str(tc),*nsm)
\ No newline at end of file