// yukicoder: No.326 あみだますたー
// 2019.5.14 bal4u

#include <stdio.h>

#if 1
#define gc() getchar_unlocked()
#define pc(c) putchar_unlocked(c)
#else
#define gc() getchar()
#define pc(c) putchar(c)
#endif
int in()
{
	int n = 0, c = gc();
	do n = 10*n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

void out(int n)  // 非負整数の表示（出力）
{
	int i;
	char b[20];

	if (!n) pc('0');
	else {
		i = 0; while (n) b[i++] = n % 10 + '0', n /= 10;
		while (i--) pc(b[i]);
	}
}

int a[102], id[102];
typedef struct { int id, a; } T;
T tbl[102];
int ans[10100], sz;

int bubbleSort(T *tbl, int n)
{
    int i, f;
	T t;

	sz = 0;
    do {
        f = 0;
        for (i = n-1; i > 0; i--) {
            if (tbl[i].id < tbl[i-1].id) {
				ans[sz++] = i;
                t = tbl[i-1], tbl[i-1] = tbl[i], tbl[i] = t;
                f = 1;
            }
        }
    } while (f);
}

int main()
{
	int i, N, K, x, y, t;

	N = in(), K = in();
	for (i = 1; i <= N; i++) a[i] = i;
	while (K--) {
		x = in(), y = in();
		t = a[x], a[x] = a[y], a[y] = t;
	}
	for (i = 1; i <= N; i++) id[i] = in();
	for (i = 1; i <= N; i++) tbl[i].a = a[i], tbl[i].id = id[a[i]];
//	for (i = 1; i <= N; i++) printf("(id=%d, a=%d) ", tbl[i].id, tbl[i].a);
//	printf("\n");

	bubbleSort(tbl+1, N);
	out(sz), pc('\n');
	for (i = 0; i < sz; i++) {
		out(ans[i]), pc(' '), out(ans[i]+1), pc('\n');
	}
	return 0;
}