import sys
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n = ni()
p = [x-1 for x in na()]

ans = []
for i in range(n):
    for j in range(n-1):
        if p[j] > p[j+1]:
            p[j], p[j+1] = p[j+1], p[j]
            ans.append(j + 1)

Yes()
print(len(ans))
for i in ans:
    print(i)