#include<bits/stdc++.h>
using namespace std;
int main(){
freopen("p1057.in","r",stdin);
freopen("p1057.out","w",stdout);
int n,i,j,k,a[100000]={0};
scanf("%d",&n);
for(i=1;i<=n;i++)scanf("%d",&a[i]);
sort(a+1,a+n+1);
a[0]=a[1]-1;
for(i=1;i<=n;i++)if(a[i]!=a[i-1])printf("%d\n",a[i]);
fclose(stdin);
fclose(stdout);
}
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