#include<bits/stdc++.h>
#define EM 1000000
using namespace std;
using LL = long long;
using P = pair<LL, LL>;
LL LINF = 1e18;
int INF = 1e9;
LL mod = 1e9+7;
using vint = vector<int>;
using vLL = vector<LL>;
using vvint = vector<vector<int>>;
using vvLL = vector<vector<LL>>;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

int main(){
    int N, K;
    cin >> N >> K;
    vector<int> x(K), y(K), end(N);
    for(int i = 0;i < K;i++){
        int xi, yi;
        cin >> xi >> yi;
        x[i] = xi-1, y[i] = yi-1;
    }
    for(int i = 0;i < N;i++){
        cin >> end[i];
        end[i]--;
    }
    vector<int> srt(N);
    iota(srt.begin(), srt.end(), 0);
    for(int i = 0;i < K;i++){
        int id = x[i];
        srt[id] ^= srt[id+1];
        srt[id+1] ^= srt[id];
        srt[id] ^= srt[id+1];
    }
    vector<pair<int, int>> ans;
    for(int i = 0;i < N;i++){
        int ci;
        for(int j = 0;;j++){
            if(srt[j] == end[i]){
               ci = j;
               break;
            }
        }
        for(int j = ci-1; j >= i;j--){
            ans.push_back(make_pair(j, j+1));
//            srt[j] ^= srt[j+1];
//            srt[j+1] ^= srt[j];
//            srt[j] ^= srt[j+1];
            int tmp;
            tmp = srt[j];
            srt[j] = srt[j+1];
            srt[j+1] = tmp;
        }
    }
    cout << ans.size() << endl;
    for(int i = 0;i < ans.size();i++)   cout << (ans[i].first+1) << " " << (ans[i].second+1) << endl;
}