문자열 덧셈. 매개변수로 주고 dfs import sys input = sys.stdin.readline def DFS(sum_num, answer): global cnt if sum_num > n: return if n == sum_num: cnt += 1 if cnt == k: print(answer[:-1]) exit() for i in (1, 2, 3): DFS(sum_num + i, answer+str(i)+'+') cnt = 0 n, k = map(int, input().split()) DFS(0, '') print(-1)