#!/usr/bin/env python3

import itertools


def main():
    n = int(input())
    k = int(input())
    target = list(range(n))
    for _ in range(k):
        x, y = (int(w) - 1 for w in input().split())
        target[x], target[y] = target[y], target[x]
    zs = [int(z) - 1 for z in input().split()]
    for i in range(n):
        target[i] = zs[target[i]]
    ans = []
    for _, j in itertools.product(range(n), range(n - 1)):
        if target[j] > target[j + 1]:
            target[j], target[j + 1] = target[j + 1], target[j]
            ans.append((j, j + 1))
    print(len(ans))
    for x, y in ans:
        print(x + 1, y + 1)


if __name__ == '__main__':
    main()