/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int k = Integer.parseInt(br.readLine());
        int l = Integer.parseInt(br.readLine());
        
        String[] lines;
        ArrayList<Pair> pairs = new ArrayList<Pair>();
        for(int i=0;i<l;i++){
            lines = br.readLine().split(" ");
            pairs.add(new Pair(Integer.parseInt(lines[0])-1,Integer.parseInt(lines[1])-1));
        }
        lines = br.readLine().split(" ");
        
        for(Pair pair:pairs){
            String tmp = lines[pair.a];
            lines[pair.a] = lines[pair.b];
            lines[pair.b] = tmp;
        }
        
        int[] nlines = new int[k];
        int i=0;
        for(String st:lines){
            nlines[i++] = Integer.parseInt(st);
        }
        
        int cnt = 0;
        StringBuilder ans = new StringBuilder();
        for(i=0;i<k-1;i++){
            if(nlines[i] > nlines[i+1]){
                ans.append(i+1).append(" ").append(i+2).append("\n");
                int tmp = nlines[i];
                nlines[i] = nlines[i+1];
                nlines[i+1] = tmp;
                i=-1;
                cnt++;
            }
        }
        System.out.println(cnt);
        System.out.println(ans);
    }
    
    public static class Pair{
        public int a;
        public int b;
        public Pair(int a,int b){
            this.a = a;
            this.b = b;
        }
    }
}