N = int(input())
K = int(input())
who = list(range(N + 1))
for i in range(K):
    a, b = map(int, input().split())
    who[a], who[b] = who[b], who[a]
f = list(map(int, input().split()))
after = [0] * (N + 1)
for i in range(N):
    after[f[i]] = i + 1
ans = []

for i in range(1, N + 1):
    pos = who.index(after[i])
    while pos > i:
        ans.append(pos - 1)
        who[pos - 1], who[pos] = who[pos], who[pos - 1]
        pos -= 1

print(len(ans))
for a in ans:
    print(a, a + 1)