#include using namespace std; #define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++) #define rep(i,n) repl(i,0,n) #define mp(a,b) make_pair((a),(b)) #define pb(a) push_back((a)) #define all(x) (x).begin(),(x).end() #define uniq(x) sort(all(x)),(x).erase(unique(all(x)),end(x)) #define fi first #define se second #define dbg(...) _dbg(#__VA_ARGS__, __VA_ARGS__) void _dbg(string){cout< void _dbg(string s,H h,T... t){int l=s.find(',');cout< ostream& operator<<(ostream& o, const pair &p){o<<"("< ostream& operator<<(ostream& o, const vector &v){o<<"[";for(T t:v){o<>s; vector cnt(26,0); rep(i,s.size()) cnt[s[i]-'a']++; int x = -1; rep(i,13){ if(cnt[i]==0){ if(x!=-1) return false; x = i; } if(cnt[i]>2) return false; } repl(i,13,26) if(cnt[i]>0) return false; if(x>=0){ cout << (char)(x+'a') << endl; } else { rep(i,13) cout << (char)(i+'a') << endl; } return true; } int main(){ if(!solve()) cout << "Impossible" << endl; return 0; }