N = int(input())
K = int(input())
XY = [list(map(int,input().split())) for _ in range(K)]
A = list(map(int,input().split()))

for x,y in XY:
    x -= 1
    y -= 1
    A[x],A[y] = A[y],A[x]

ans = []
for i in range(1,N+1):
    x = A.index(i)
    while x >= i:
        A[x-1],A[x] = A[x],A[x-1]
        ans.append((x,x + 1))
        x -= 1
print(len(ans))
for a in ans:
    print(*a)