#include <bits/stdc++.h>
using namespace std;
string uniqueCharString(string s)
{
int a[256]={0};
string m;
for(int i=0;i<s.length();i++)
{
a[s[i]]++;
}
int j=0;
for(int i=0;i<256;i++)
{
if(a[s[i]]==1)
m[j++]=s[a[i]];
}
return m;
// Your code here
}
int main()
{
int t;
cin>>t;
while(t--)
{
string s;
cin>>s;
string a=uniqueCharString(s);
cout<<a<<"\n";
}
}
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