bjfu 1009

#include<iostream>
using namespace std;
int main(){
	int s[100];
	int *a;
		int n;
	
	while(cin>>n){memset(s,0,sizeof(s));
		a=new int [n];
		for(int i=0;i<n;i++){
			cin>>a[i];
		}

		for(int i=0;i<n;i++){
			for(int j=i+1;j<n;j++){
				if(!(a[i]^a[j]))//indifferent
					//cout<<a[i]<<a[j]<<"*********";
				{	s[i]=66;s[j]=66;}
			}
		}
		for(int i=0;i<n;i++){
			if(s[i]==0)
				printf("%d\n",a[i]);
			//cout<<s[i];
		}
	}
return 0;
}