#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(long long)(n);++i)
#define all(a) a.begin(), a.end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
 
const ll MOD=1000000007;
const ll INF=1e18;
const int MAX=510000;
const double pi=acos(-1);
int dx[8] = {1,0,-1,0,1,1,-1,-1};
int dy[8] = {0,1,0,-1,-1,1,1,-1};

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false); 
  
  string s;
  cin >> s;
  int two=0;
  int one=0;
  int num=-1;
  int alp[13]={};
  rep(i,13) alp[s[i]-'a']++;
  rep(i,13){
    if(alp[i]==2) two++;
    if(alp[i]==1) one++;
    if(alp[i]==0) num=i;
    if(alp[i]>2){
      cout << "Impossible" << endl;
      return 0;
    }
  }
  if(two==1)cout << char('a'+num) << endl;
  else if(two==0)rep(i,13)cout << char('a'+i) << endl;
  else cout << "Impossible" << endl;
  
    
  return 0;
}