백준(BaekJoon)_15657_N과 M(8)

n,m = map(int, input().split())
num_list = list(map(int, input().split())) 
result = []

def func(idx):
    if len(result) == m:
        print(" ".join(map(str,result)))
        return 
    else:
        num_list.sort()
        for idx in range(idx,len(num_list)):
            result.append(num_list[idx])
            func(idx)
            result.pop()
func(0)