package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)
var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func main() {
	sc.Split(bufio.ScanWords)
	in := make([]int, 0, 6000)
	out := make([]int, 0, 6000)
	n := nextInt()
	k := nextInt()
	s := make([]int, 0, n)
	g := make([]int, 0, n)
	ret := make([][2]int, 0, 100)

	for i := 1; i <= n; i++ {
		s = append(s, i)
	}

	for i := 0; i < k; i++ {
		i, o := nextInt(), nextInt()
		s[i-1], s[o-1] = s[o-1], s[i-1]
		in = append(in, i)
		out = append(out, o)
	}
	for i := 0; i < n; i++ {
		g = append(g, nextInt())
	}

	for i, v := range g {
		for j, v2 := range s {
			if v == v2 {
				if i == j {
					break
				}
				ret = append(ret, [2]int{i, j})
			}
		}
	}
	fmt.Println(len(ret))
	for _, v := range ret {
		for i := v[1]; i > v[0]; i-- {
			fmt.Println(i, i+1)
		}
	}
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func nextInt64() int64 {
	i, _ := strconv.ParseInt(nextLine(), 10, 64)
	return i
}

func nextUint64() uint64 {
	i, _ := strconv.ParseUint(nextLine(), 10, 64)
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(nextLine(), 64)
	return f
}

func readLine() string {
	buf := make([]byte, 0, 1000000)
	for {
		l, p, e := rdr.ReadLine()
		if e != nil {
			panic(e)
		}
		buf = append(buf, l...)
		if !p {
			break
		}
	}
	return string(buf)
}

func factor(n uint64) []uint64 {
	if n <= 1 {
		return []uint64{n}
	}

	ps := make([]uint64, 0, 100)

	for i := uint64(2); i*i <= n; i++ {
		for n%i == 0 {
			n /= i
			ps = append(ps, i)
		}
	}
	if n > 1 {
		ps = append(ps, n)
	}
	return ps
}

func gcd(a, b uint64) uint64 {
	for ; b != 0; b, a = a%b, b {
	}
	return a
}

func lcm(a, b uint64) uint64 {
	return (a * b) / gcd(a, b)
}