#include <bits/stdc++.h> #define N 1000 using namespace std; int main() { int t; cin>>t; while(t--) { string str1,str2; cin>>str1>>str2; int k=0; char ans[100010]; int hashtable[256]; fill(hashtable,hashtable+256,0); for(int i=0;i<str1.size();i++) hashtable[str1[i]-'A']++; for(int i=0;i<str2.size();i++) { if(hashtable[str2[i]-'A']>0) { ans[k++]=str2[i]; hashtable[str2[i]-'A']--; } } ans[k]='\0'; sort(ans,ans+k); if(k==0) cout<<"-1"; else cout<<ans; if(t>0) cout<<endl; } } |
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