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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n,i;
- set<char>::iterator it1;
- string si;
- set<char>s;
- cin>>n;
- while(n--){
- cin>>si;
- if(si.size()==1)cout<<si<<endl;
- else{
- for(i=0;i<si.size()-1;i++){
- if(si[i+1]!=si[i])s.insert(si[i]);
- else i++;
- }
- if(si[si.size()-1]!=si[si.size()-2])s.insert(si[si.size()-1]);
- if(s.empty())cout<<endl;
- else{
- for (it1 = s.begin(); it1!=s.end(); ++it1)
- cout << *it1;
- cout<<endl;
- }
- s.clear();
- }
- }
- return 0;
- }
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