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- #include<bits/stdc++.h>
- using namespace std;
- int main(){
- int t;
- cin>>t;
- while(t--){
- string s,t;
- cin>>s>>t;
- int a[26]={};
- for(int i=0;i<t.length();i++){
- a[t[i]-'a']++;
- }
- int flag=0,mc=0;
- while(s[mc]==s[0])
- mc++;
- for(int i=0;i<s.length();i++){
- if(a[s[i]-'a']<=0){
- cout<<"Impossible\n";
- flag=1;
- break;
- }else{
- a[s[i]-'a']--;
- }
- }
- if(flag==0){
- string b="",c="";
- for(int i=0;i<26;i++){
- while(a[i]>0 && ((s[0]<s[mc] && i<=s[0]-'a') || i<s[0]-'a')){
- b+=(i+'a');
- a[i]--;
- }
- }
- for(int i=0;i<26;i++){
- while(a[i]>0){
- c+=(i+'a');
- a[i]--;
- }
- }
- cout<<(b+s+c)<<"\n";
- }
- }
- return 0;
- }
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