void solve() {
  string s;
  cin >> s;
  if (s.size() <= 1) {
    cout << "IMPOSSIBLE" << '\n';
    return;
  }
  vector <int> a(26);
  for (int i = 0; i < s.size(); ++i) {
    a[s[i]-'a']++;
  }
  string temp;
  for (int i = 0; i < s.size(); ++i) {
    for (int j = 0; j < 26; ++j) {
      if (a[j] && 'a' + j != s[i]) {
        temp += 'a' + j;
        a[j]--;
        break;
      }
    }
  }
  if (temp.size() != s.size()) {
    char ch;
    for (int i = 0; i < 26; ++i) {
      if (a[i]) {
        ch = 'a'+i;
      }
    }
    if (!temp.size()) {
      cout << "IMPOSSIBLE" << '\n';
      return;
    }
    char temp_ch = temp[temp.size()-1];
    temp[temp.size()-1] = ch;
    temp += temp_ch;
  }
  if (temp.size() != s.size()) {
    cout << "IMPOSSIBLE" << '\n';
    return;
  }
  for (int i = 0; i < s.size(); ++i) {
    if (s[i] == temp[i]) {
      cout << "IMPOSSIBLE" << '\n';
      return;
    }
  }
  cout << s << '\n';
  cout << temp << '\n';
}