#include <algorithm>
#include <iostream>
#include <numeric>
#include <string>
#include <tuple>
#include <utility>
#include <vector>

#define rep(i, a, b) for (int i = int(a); i < int(b); i++)
using namespace std;
using ll = long long int;
using P = pair<ll, ll>;

// clang-format off
#ifdef _DEBUG_
#define dump(...) do{ cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = "; debug_print(__VA_ARGS__); } while(false)
template<typename T, typename... Ts> void debug_print(const T &t, const Ts &...ts) { cerr << t; ((cerr << ", " << ts), ...); cerr << endl; }
#else
#define dump(...) do{ } while(false)
#endif
template<typename T> vector<T> make_v(size_t a, T b) { return vector<T>(a, b); }
template<typename... Ts> auto make_v(size_t a, Ts... ts) { return vector<decltype(make_v(ts...))>(a, make_v(ts...)); }
template<typename T> bool chmin(T &a, const T& b) { if (a > b) {a = b; return true; } return false; }
template<typename T> bool chmax(T &a, const T& b) { if (a < b) {a = b; return true; } return false; }
template<typename T, typename... Ts> void print(const T& t, const Ts&... ts) { cout << t; ((cout << ' ' << ts), ...); cout << '\n'; }
template<typename... Ts> void input(Ts&... ts) { (cin >> ... >> ts); }
template<typename T> istream &operator,(istream &in, T &t) { return in >> t; }
// clang-format on

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n, k;
    cin, n, k;
    vector<int> cur(n);
    iota(cur.begin(), cur.end(), 0);
    rep(i, 0, k) {
        int x, y;
        cin, x, y;
        swap(cur[x - 1], cur[x]);
    }
    vector<int> goal(n);
    rep(i, 0, n) {
        int a;
        cin, a;
        goal[a - 1] = i;
        // goal[i] = a - 1;
    }

    vector<int> ans;

    rep(i, 0, n) {
        for (int j = n - 1; j > i; j--) {
            if (cur[j] == goal[i]) {
                swap(cur[j - 1], cur[j]);
                ans.push_back(j);
            }
        }
    }

    print(ans.size());
    for (auto x : ans) {
        print(x, x + 1);
    }

    return 0;
}