#include<bits/stdc++.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n, m;
cin>>n>>m;
vector<bitset<1001>>E(n+1);
while(m--){
int u, v;
cin>>u>>v;
E[u][v]=E[v][u]=1;
}
E[1][1]=1;
for(int i=1;i<=n;i++)
for(int j=1;j<i;j++)
if((E[1][i]+E[1][j])%2==E[i][j])
return cout<<"NE", 0;
cout<<"DA";
}
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