곽철민

n,m = map(int, input().split()) checked = [False] * (n+1) nums = [] def dfs(start): if len(nums) == m: print(*nums) return for i in range(start, n+1): if not checked[i]: checked[i] = True nums.append(i) dfs(i+1) checked[i] = False nums.pop() dfs(1)