#include using namespace std; int n,cnt; bool check(int a){ for(int i=2;i*i<=a;i++){ if(a%i0)return false; } return true; } int main(){ cin>>n; for(int i=2;i<=n;i++){ if(i+2<=n&&check(i)&&check(i+2)){ cout<<i<<" "<<i+2<<endl; cnt=1; } } if(cnt0)cout<<"empty"; return 0;

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