from operator import itemgetter
N = int(input())
K = int(input())
V = list(range(N+1))

for x, y in (map(int, input().split()) for _ in [0]*K):
    V[x], V[y] = V[y], V[x]

goal, _ = zip(*sorted(enumerate(map(int, input().split()), start=1), key=itemgetter(1)))
ans = []

for i, v in enumerate(goal, start=1):
    pos = V.index(v)
    if i == pos:
        continue
    r = zip(range(pos-1, i-1, -1), range(pos, i, -1)) if i < pos else zip(range(i, pos), range(i+1, pos+1))
    for j, k in r:
        ans.append((j, k))
        V[j], V[k] = V[k], V[j]

print(len(ans))
for l in ans:
    print(*l)