This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#include <bits/stdc++.h>
using namespace std;
#define sqr 340
#define mid (l+r)/2
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define ins insert
#define era erase
#define C continue
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define mset multiset
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pi> vpi;
typedef vector<pll> vpll;
const ll mod=1000000007;
const ll inf=1e18*4;
const ld pai=acos(-1);
int n;
string s[109],ss[109];
vi v[29];
int done[29],deg[29],ans[29];
void dfs(int node){
done[node]=1;
for(auto u:v[node]){
if(done[u]==2)C;
if(done[u]==1)cout<<"NE"<<endl,exit(0);
dfs(u);
}
done[node]=2;
}
void make(string a,string b){
int z=0;
for(int i=0;i<min((int) a.size(),(int) b.size());i++){
if(a[i]==b[i])C;
z=1;
v[a[i]-'a'].pb(b[i]-'a');
deg[b[i]-'a']++;
break;
}
if(!z && a.size()>b.size())cout<<"NE"<<endl,exit(0);
}
int main(){
cin>>n;
for(int i=0;i<n;i++)cin>>ss[i];
for(int i=0;i<n;i++){
int x;cin>>x;
x--;
s[i]=ss[x];
}
for(int i=0;i<n-1;i++){
make(s[i],s[i+1]);
}
for(int i=0;i<26;i++){
if(done[i]==0)dfs(i);
}
queue<int>q;
for(int i=0;i<26;i++)
if(deg[i]==0)q.push(i);
int last=(int) 'a';
while(q.size()){
int node=q.front();q.pop();
ans[node]=last++;
for(auto u:v[node]){
deg[u]--;
if(deg[u]==0)q.push(u);
}
}
if(last!=(int)'z'+1){
while(1){
}
}
cout<<"DA"<<endl;
for(int i=0;i<26;i++)cout<<(char)ans[i];
cout<<endl;
}
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