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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int main() {
int n , k ;
f >> n;
f >> k;
int a[n] , b[k] , c[max(n , k)] ;
for(int i = 0; i < n ; i++){
f >> a[i] ;
}
for(int i = 0 ; i < n ; i++){
f >> b[i] ;
}
int z = 0 ;
for(int i = 0 ; i < n ; i++)
for(int j = 0 ; j < k ; j++)
if(a[i] == b[j]){
c[z] = a[i] ;
z++ ;
}
g << z << endl ;
for(int i = 0 ; i < z ; i++){
g << c[i] << " " ;
}
}