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