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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int A[1024],B[1024],M,N;
int i,j,ok,k,aux;
int C[1024];
int main()
{ f>>M>>N;
for(i=1;i<=M;i++)
f>>A[i];
for(i=1;i<=N;i++)
f>>B[i];
if(M>=N)
{
for(i=1;i<=M;i++)
for(j=aux+1;j<=N;j++)
if(A[i]==B[j])
{
ok++;
C[++k]=A[i];
aux=j;
}
}
else
{
for(i=1;i<=N;i++)
for(j=aux+1;j<=M;j++)
if(A[i]==B[j])
{
ok++;
C[++k]=A[i];
aux=j;
}
}
g<<ok<<"\n";
for(i=1;i<=ok;i++)
g<<C[i]<<" ";
return 0;
}