#include<iostream>
#include<vector>

using namespace std;

vector<int> L;
vector<int> R;

int amida_to(int n){
	for(int i=0;i<L.size();i++){
		if(L[i]==n) n=R[i];
		else if(R[i]==n) n=L[i];
	}
	return n;
}

#define NMAX 100

int main(){

	int N,K,X,Y,A[NMAX];
	int NM;

	cin>>N;
	cin>>K;

	NM=N;

	for(int i=0;i<K;i++){
		cin>>X>>Y;
		L.push_back(X);
		R.push_back(Y);
	}

	for(int i=0;i<N;i++){
		cin>>A[i];
	}

	while(NM!=0){
		int ii;
		for(ii=0;;ii++){
			if(A[ii]==NM) break;
		}
		int to=amida_to(ii+1);
		while(to>NM){
			L.push_back(to-1);
			R.push_back(to);
			to--;
		}
		while(to<NM){
			L.push_back(to);
			R.push_back(to+1);
			to++;
		}
		NM--;
	}

	cout<<L.size()-K<<endl;
	for(int i=K;i<L.size();i++){
		cout<<L[i]<<" "<<R[i]<<endl;
	}
}