import java.net.NetworkInterface;
import java.util.*;

public class Main {
	static long gcd(long a,long b){
		return b == 0 ? a : gcd(b, a%b);
	}
	static long lcm(long a, long b){
		return a*b/gcd(a, b);
	}
	static int[] dx = {1,0,-1,0};
	static int[] dy = {0,1,0,-1};
	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int n = sc.nextInt();
		int m = sc.nextInt();
		int[] moto = new int[n+1];
		int[] ch1 = new int[m];
		int[] ch2 = new int[m];
		for(int i=0;i<m;i++){
			ch1[i] = sc.nextInt();
			ch2[i] = sc.nextInt();
		}
		int[] goal = new int[n+1];
		for(int i=1;i<=n;i++){
			goal[sc.nextInt()] = i;
			moto[i] = i;
		}
		for(int i=0;i<m;i++){
			int tmp=moto[ch1[i]];
			moto[ch1[i]]=moto[ch2[i]];
			moto[ch2[i]]=tmp;
		}
		int ans = 0;
		StringBuilder sb = new StringBuilder();
		for(int i=1;i<n;i++){
			if(moto[i]==goal[i]){
				continue;
			}
			int b = 0;
			for(int j=1;j<=n;j++)if(moto[j]==goal[i]) b = j;
			for(int j=b;j>i;j--){
				int tmp = moto[j];
				moto[j]=moto[j-1];
				moto[j-1]=tmp;
				ans++;
				sb.append(j-1+" "+(j)+"\n");
			}
		}
		System.out.println(ans);
		System.out.println(sb);
	} 
}