import sys

input = sys.stdin.readline
int1 = lambda x: int(x) - 1

N = int(input())
K = int(input())
amida = list(range(1, N + 1))
for _ in range(K):
    x, y = map(int1, input().split())
    amida[x], amida[y] = amida[y], amida[x]

# print(amida)

A = map(int, input().split())
final = [0] * N
for i, a in enumerate(A, 1):
    final[a - 1] = i
tmp = [0] * (N + 1)
new_amida = [0] * N
for i, x in enumerate(amida):
    tmp[x] = i
for i, a in enumerate(final, 1):
    new_amida[tmp[a]] = i

# print(new_amida)

# bubblesort
ans = []
for i in range(N):
    for j in reversed(range(i + 1, N)):
        if new_amida[j - 1] > new_amida[j]:
            new_amida[j - 1], new_amida[j] = new_amida[j], new_amida[j - 1]
            ans.append((j, j + 1))
print(len(ans))
for x, y in ans:
    print(x, y)