#include
#include
using namespace std;
int main(){
int n ,no,i;
cin>>n;
int a[n]={0};
for (i=0; i<n ; i++){
cin>> a[i];
}
sort(a,a+n);
int non,start,end ;
cin>>non;
start = 0;
end=n-1;
while(start<=end){
int sum ;
sum =a[end]+a[start];
/*while (non<a[end]){
end--;
}*/
while(sum<non){
start++;
}
if (sum> non){
end--;}
if (sum == non){
cout<<a[start]<<" and "<<a[end]<< endl;
start++;
}
}
}
