212

#include<iostream>#include<cstdio>#include<algorithm>#include<vector>using namespace std;int main(){    freopen("in.txt","r",stdin);    vector<int> v1,v2,v3;    int x;    while(cin>>x&&x!=-1){        v1.push_back(x);    }    bool flag=false;    while(cin>>x&&x!=-1){        if(binary_search(v1.begin(),v1.end(),x)){            cout<<(flag==true ? " ": "")<<x;            flag=true;        }    }    if(flag==false){        cout<<"NULL";    }    cout<<endl;}