#include <bits/stdc++.h>
using namespace std;
#define fwd(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) fwd(i, 0, n)
#define all(X) X.begin(), X.end()
#define sz(X) int(size(X))
#define pb push_back
#define eb emplace_back
#define st first
#define nd second
using pii = pair<int, int>; using vi = vector<int>;
using ll = long long; using ld = long double;
#ifdef LOC
auto SS = signal(6, [](int) {* (int *) 0 = 0;});
#define DTP(x, y) auto operator << (auto& o, auto a) -> decltype(y, o) {o << "("; x; return o << ")";}
DTP(o << a.st << ", " << a.nd, a.nd);
DTP(for(auto i : a) o << i << ", ", all(a));
void dump(auto... x) {((cerr << x << ", "), ...) << "\n";}
#define deb(x...) cerr << setw(4) << __LINE__ << ":[" #x "]: ", dump(x)
#else
#define deb(...) 0
#endif

int32_t main(){
    cin.tie(0)->sync_with_stdio(0);
    cout << fixed << setprecision(10);

    int n, m;
    cin >> n >> m;

    cout << "YES\n" << 2*m << '\n';
    rep(_, m) {
        int a, b;
        cin >> a >> b;

        vi p = {a, b};
        fwd(i, 1, n+1) if (i != a && i != b) p.pb(i);

        for (int i : p) cout << i << ' '; cout << '\n';

        reverse(all(p));
        swap(p.back(), p[n-2]);

        for (int i : p) cout << i << ' '; cout << '\n';
    }

    return 0;
}