N=int(input())
K=int(input())

A=list(range(N+1))

for i in range(K):
    x,y=map(int,input().split())
    A[x],A[y]=A[y],A[x]

X=[0]+list(map(int,input().split()))

for i in range(N+1):
    A[i]=X[A[i]]

ANS=[]

for i in range(N+1):
    k=A.index(i)

    for j in range(k-1,i-1,-1):
        ANS.append((j,j+1))
        A[j],A[j+1]=A[j+1],A[j]

print(len(ANS))
for x,y in ANS:
    print(x,y)