#ifdef LOCAL
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>
#define ll long long
#define vi vector<int>
#define vvi vector<vi>
#define all(x) x.begin(), x.end()
#define pb push_back
#define mp make_pair
int INF = (int)2e9;
using namespace std;
template <class T>
istream& operator >>(istream &in, vector<T> &arr) {
for (T &cnt : arr) {
in >> cnt;
}
return in;
};
int matr[1000][1000];
bool visited[1000];
int state[1000];
bool kek1 = true, kek2 = true;
int n;
void solve() {
int m; cin >> n >> m;
for (int j = 0; j < m; ++j){
int v, u; cin >> v >> u;
matr[v - 1][u - 1] = 1;
matr[u - 1][v - 1] = 1;
}
for (int i = 0; i < n; ++i){
for (int j = i + 1; j < n; ++j){
if (matr[i][j])
state[j] = state[i];
else
state[j] = state[i] ^ 1;
}
}
for (int i = 0; i < n; ++i){
for (int j = i + 1; j < n; ++j){
if ((matr[i][j] + state[i] + state[j]) % 2 == 0){
cout << "NE";
return;
}
}
}
cout << "DA";
}
int main() {
#ifdef LOCAL
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#else
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
#endif
solve();
return 0;
}
