n=input()
R=range
K=R(input())
r=lambda:map(int, raw_input().split())
m=R(n)
for i in K:x,y=r();m[x],m[y-2]=m[y-2],m[x]
a=r()
m=[m.index(a.index(i+1))for i in R(n)]
A=[]
for i in R(n):
 for j in R(1,n):
  if m[j-1]>m[j]:m[j],m[j-1]=m[j-1],m[j];A+=[j]
print len(A)
for x in A[::-1]:print x,x+1