#include<iostream>
#include<unordered_map>
#include<queue>
#define rep(i,a,b) for(long int i=a;i<b;i++)
#define ull unsigned long long
using namespace std;

int main()
{
    long int a,b,c;
    cin>>a>>b>>c;
    unordered_map<int,int> um;
    // int *array1=new int[a];
    int *array1=new int[a];
    int *array2=new int[b];
    int *array3=new int[c];
    rep(i,0,a) {
        cin>>array1[i];
         um[array1[i]]++;
    }
    rep(i,0,b) {
        cin>>array2[i];
    }
    rep(i,0,c) {
        cin>>array3[i];
    }
    queue<int> output;
    long int count=0;
    long  int i=0,j=0;
    while(i<b && j<c){
        if(array2[i]>array3[j]){
            if(um.find(array3[j])!=um.end()){
                count++;
                output.push(array3[j]);
            } 
                j++;
        }
        else if(array2[i]<array3[j]){
            if(um.find(array2[i])!=um.end()){
                count++;
                output.push(array2[i]);
            } 
                i++;
        }
        else{
            count++;
            output.push(array2[i]);
            i++;
            j++;
        }
    }
    while(i<b){
        if(um.find(array2[i])!=um.end()) {
        count++;
        output.push(array2[i]);
        }
        i++;
    }
    while(j<c){
        if(um.find(array3[j])!=um.end()) {
        count++;
        output.push(array3[j]);
        }
        j++;
    }
    cout<<count<<endl;
   while(!output.empty())
   {
       cout<<output.front()<<endl;
       output.pop();
   }

return 0;
}