N = int(input())
A = list(map(int, input().split()))
stack = [A[0]]
ans = []
for i in range(1, N):
    while len(stack) >= 2:
        if stack[-1] < A[i]:
            ans.append(stack.pop())
        else:
            break
    if stack[-1] < A[i]:
        ans.append(A[i])
    else:
        stack.append(A[i])

if len(ans) == N - 1:
    print(len(ans))
    print(*ans)
else:
    print("No")