#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <climits>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <map>
#include <functional>
#include <set>
#include <numeric>
#include <stack>
#include <utility>
#include <time.h>
#include <iterator>
//#include "util.h"

using namespace std;
typedef unsigned uint;
typedef long long lint;
typedef unsigned long long ulint;



//呪文
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const pair<_KTy, _Ty>& m) { cout << "{" << m.first << ", " << m.second << "}"; return ostr; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& ostr, const map<_KTy, _Ty>& m) { if (m.empty()) { cout << "{ }"; return ostr; } cout << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { cout << ", " << *itr; } cout << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { cout << "{ }"; return ostr; }	cout << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { cout << ", " << *itr; }	cout << "}"; return ostr; }
template <typename _Ty> ostream& operator << (ostream& ostr, const set<_Ty>& s) { if (s.empty()) { cout << "{ }"; return ostr; } cout << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { cout << ", " << *itr; }	cout << "}"; return ostr; }
//template <typename T> void print(T* v, int N) { if (N == 0) cout << "{ }"; cout << "{" << v[0]; for (int i = 1; i < N; i++) cout << ", " << v[i]; cout << "}"; }
#define PI 3.14159265358979323846
#define EPS 1e-8
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define all(x) (x).begin(), (x).end()



typedef pair<int, int> pii;

vector<vector<int> > cyclic_permutation(vector<int> v, vector<int> w)
{
	vector<vector<int> > res;
	vector<bool> used(v.size(), false);

	map<int, int> mp;
	for (int i = 0; i < v.size(); i++) mp[v[i]] = i;

	for (int i = 0; i < v.size(); i++) {
		int j = i;
		vector<int> cyclic;
		while (!used[j]) {
			used[j] = true;
			cyclic.push_back(j);
			j = w[mp[j]];
		}
		if (cyclic.size() >= 2) res.push_back(cyclic);
	}
	return res;
}

vector<pii> transposition_product(vector<int> v, vector<int> w)
{
	vector<pii> res;
	vector<vector<int> > cyclic = cyclic_permutation(v, w);
	
	for (int i = 0; i < cyclic.size(); i++)
		for (int j = 1; j < cyclic[i].size(); j++)
			res.push_back(pii(cyclic[i][0], cyclic[i][j]));

	return res;
}

vector<pii> fundamental_transposition_product(vector<int> v, vector<int> w)
{
	vector<pii> res;
	vector<pii> transposition = transposition_product(v, w);

	for (int i = 0; i < transposition.size(); i++) {
		pii p = transposition[i];
		if (p.first > p.second) swap(p.first, p.second);

		for (int j = p.first; j < p.second; j++) {
			if (!res.empty() && res.back().first == j && res.back().second == j + 1) res.pop_back();
			else res.push_back(pii(j, j + 1));
		}
		for (int j = p.second - 1; j > p.first; j--) {
			if (!res.empty() && res.back().first == j - 1 && res.back().second == j) res.pop_back();
			else res.push_back(pii(j - 1, j));
		}

	}
	return res;
}

int yuki0326()
{
	int N, K;
	cin >> N >> K;

	vector<int> v(N + 1, 0);
	map<int, int> mp;
	for (int i = 1; i <= N; i++) {
		mp[i] = i; v[i] = i;
	}

	for (int i = 0; i < K; i++) {
		int X, Y;
		cin >> X >> Y;

		swap(v[mp[X]], v[mp[Y]]);
		swap(mp[X], mp[Y]);
	}

	vector<int> w(N + 1, 0);
	for (int i = 1; i <= N; i++) cin >> w[i];

	vector<pii> step = fundamental_transposition_product(v, w);
	
	cout << step.size() << endl;
	for (int i = step.size() - 1; i >= 0; i--)
		cout << step[i].first << " " << step[i].second << endl;

	return 0;
}

int main()
{
	//clock_t start, end;
	//start = clock();

	yuki0326();

	//end = clock();
	//printf("%d msec.\n", end - start);

	return 0;
}