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()
b=[a[e]for e in m]
A=[]
for i in R(1,n)*n:
 if b[i-1]>b[i]:b[i],b[i-1]=b[i-1],b[i];A+=[i]
print len(A)
for x in A:print x,x+1