N, S = map(int, input().split())

for k in range(1, N+1):
    l = k*(k+1)//2
    r = (2*N-k+1)*k//2
    
    if l<=S<=r:
        ans = list(range(1, k+1))
        s = k*(k+1)//2
        
        for i in range(k-1, -1, -1):
            add = min(S-s, N-(k-1-i)-ans[i])
            ans[i] += add
            s += add
        
        print(k)
        print(*ans)
        exit()