#include
using namespace std;
int main(){
int n;
cin>>n;
int a[1000];
for(int i=0;i<n;i++){
cin>>a[i];
}
int s;
cin>>s;
int i=0;
int j=sizeof(a)/sizeof(int) -1;
while(i<j){
int curr= a[i] + a[j];
if(curr<s){
i++;
}
else if(curr>s){
j--;
}
else if(curr == s){
cout<<a[i]<<"and"<<a[j]<<endl;
i++;
j--;
}
}
}