#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N = int(readline())
K = int(readline())
X = [0] * K
Y = [0] * K
for i in range(K):
    X[i], Y[i] = map(int, readline().split())
*A, = map(int, read().split())

# %%
before = list(range(N))
for x, y in zip(X, Y):
    x -= 1
    y -= 1
    before[x], before[y] = before[y], before[x]

after = [0] * N
for i, x in enumerate(A):
    after[x - 1] = i

# %%
convert = {x: i for i, x in enumerate(after)}
B = [convert[x] for x in before]

# %%
operations = []
for n in range(1, N):
    while n > 0 and B[n] < B[n - 1]:
        operations.append(n)
        B[n], B[n - 1] = B[n - 1], B[n]
        n -= 1

# %%
print(len(operations))
print('\n'.join(f'{x} {x+1}' for x in operations))