using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
using System.IO;

class Program
{
    static private Magatro M = new Magatro();
    static private void Main(string[]args)
    {
        M.Scan();
        M.Solve();
    }
}

public class Scanner
{
    private string[] S;
    private int Index;
    private char Separator;

    public Scanner(char separator = ' ')
    {
        Index = 0;
        Separator = separator;
    }

    private string[] Line()
    {
        return Console.ReadLine().Split(Separator);
    }

    public string Next()
    {
        string result;
        if (S == null || Index >= S.Length)
        {
            S = Line();
            Index = 0;
        }
        result = S[Index];
        Index++;
        return result;
    }
    public int NextInt()
    {
        return int.Parse(Next());
    }
    public double NextDouble()
    {
        return double.Parse(Next());
    }
    public long NextLong()
    {
        return long.Parse(Next());
    }
}

public class Magatro
{
    private int N, K;
    private int[] X, Y;
    private int[] A;

    public void Scan()
    {
        Scanner sc = new Scanner();
        N = sc.NextInt();
        K = sc.NextInt();
        X = new int[K];
        Y = new int[K];
        A = new int[N];
        for(int i = 0; i < K; i++)
        {
            X[i] = sc.NextInt();
            Y[i] = sc.NextInt();
        }
        for(int i = 0; i < N; i++)
        {
            A[i] = sc.NextInt();
        }
    }

    public void Solve()
    {
        int[] Amida = new int[N];
        for(int i = 0; i < N; i++)
        {
            Amida[i] = i + 1;
        }
        for(int i = 0; i < K; i++)
        {
            Swap(ref Amida[X[i] - 1], ref Amida[Y[i] - 1]);
        }
        int[] source = new int[N];
        for(int i = 0; i < N; i++)
        {
            source[Array.IndexOf(Amida,A[i])] = i + 1;
        }
        int cnt=0;
        List<string> SwapList = new List<string>();
        for(int i = source.Length - 1; i >= 1; i--)
        {
            for(int j = 0; j < i; j++)
            {
                if (source[j] > source[j + 1])
                {
                    Swap(ref source[j], ref source[j + 1]);
                    SwapList.Add(string.Format("{0} {1}", j, j + 1));
                    cnt++;
                }
            }
        }
        Console.WriteLine(cnt);
        Console.WriteLine(string.Join("\n", SwapList));
    }

    private void Swap(ref int a,ref int b)
    {
        int temp = a;
        a = b;
        b = temp;
    }
}