#include <bits/stdc++.h>
using namespace std;
int n,a[25];
int main() {
while(scanf("%d",&n)){
for(int i=0;i<n;i++){
cin>>a[i];
}
sort(a,a+n);
int len=unique(a,a+n)-a;
for(int i=0;i<len;i++){
cout<<a[i];
}
}
return 0;
}
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