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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");\
int M,N;
int A[1024], B[1024], x[1024];
void read ()
{
fin>>M;
fin>>N;
for(int i = 0; i < M;i++)
{
fin>>A[i];
}
for(int j = 0; j < N; j++)
{
fin>>B[j];
}
}
void subsir()
{
int k=0;
for(int i = 0; i< M; i++ )
{
for(int j = 0; j < N; j++)
{
if(A[i]==B[j])
{
x[k]=A[i];
k++;
}
}
}
fout<<k<<"\n";
for(int i=0;i<k;i++)
{
fout<<x[i]<<" ";
}
}
int main()
{
read();
subsir();
return 0;
}