I,O=input,print
N=int(I())
P=[0]+list(map(int,I().split()))
U=[0]+[0]*N
A=[]
for i in range(1,N+1):
	j=P[i]
	if U[i]or j==i:continue
	while j^i:
		U[j],k=1,i
		while k<j:
			A+=[k]
			k+=1
		k-=2
		while k>=i:
			A+=[k]
			k-=1
		j=P[j]
O("Yes")
O(len(A))
for a in A:O(a)