#include
using namespace std;
int main(){
int n;
cin>>n;
int a[n];
for(int i=0; i<n; i++){
cin>>a[i];
}
int left = 0;
int right = n-1;
int target;
cin>>target;
while(left<right){
int sum = a[left] + a[right];
if(sum>target){
right--;
}
else if(sum<target){
left++;
}
else if(sum==target){
cout<< a[left]<< " and "<<a[right];
left++;
right--;
}
}
return 0;
}