This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 100007;
const ll inf = 1e9;
const ll mod = 1e9 + 7;
const double pi = acos(-1);
const double eps = 1e-6;
const int dx[] = {0, -1, 0, 1}, dy[] = {1, 0, -1, 0};
const int block = 320;
map <string, int> mp;
string s1[M], s2[M];
int n, sz[M], p[M], a[M], b[M], tot;
int root(int x){
while(x != p[x]){
p[x] = p[p[x]];
x = p[x];
}
return x;
}
void connect(int x, int y){
x = root(x); y = root(y);
if(x == y) return;
if(sz[x] > sz[y]) swap(x, y);
p[x] = y;
sz[y] += sz[x];
return;
}
bool is(string s) { return (s[0] >= '0' && s[0] <= '9'); }
int main(){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
for(int i = 1; i <= n; ++i){
cin >> s1[i];
if(!mp[s1[i]]) mp[s1[i]] = ++tot;
a[i] = mp[s1[i]];
s1[i] = s1[i][0];
p[a[i]] = a[i];
sz[a[i]] = 1;
}
for(int i = 1; i <= n; ++i){
cin >> s2[i];
if(!mp[s2[i]]) mp[s2[i]] = ++tot;
b[i] = mp[s2[i]];
s2[i] = s2[i][0];
p[b[i]] = b[i];
sz[b[i]] = 1;
}
for(int i = 1; i <= n; ++i) connect(a[i], b[i]);
for(int i = 1; i <= n; ++i){
for(int j = i + 1; j <= n; ++j){
if(is(s1[i]) && is(s2[j]) && a[i] != b[j] && root(a[i]) == root(b[j])) cout << "NE\n", exit(0);
if(is(s1[i]) && is(s1[j]) && a[i] != a[j] && root(a[i]) == root(a[j])) cout << "NE\n", exit(0);
if(is(s2[i]) && is(s2[j]) && b[i] != b[j] && root(b[i]) == root(b[j])) cout << "NE\n", exit(0);
}
}
cout << "DA\n";
return 0;
}
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