import sys input = sys.stdin.readline n, m = map(int, input().split()) ans = [] arr = [*sorted(map(int, input().split()))] def backTracking(): if len(ans) == m: print(' '.join(map(str, ans))) return for i in arr: if len(ans) > 0 and max(ans) > i: continue ans.append(i) backTracking() ans.pop() backTracking()