#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;
}

int main(){

	int N,K,X,Y,A;

	cin>>N;
	cin>>K;

	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;
		int to=amida_to(i+1);
		while(to>A){
			L.push_back(to-1);
			R.push_back(to);
			to--;
		}
		while(to<A){
			L.push_back(to);
			R.push_back(to+1);
			to++;
		}
	}

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