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#include <iostream>
#include <fstream>
using namespace std;
ifstream fi("cmlsc.in");
ofstream fo("cmlsc.out");
short int m(short int a,short int b)
{
if (a<b) return a;
return b;
}
void read(short int v[],short int x)
{
for (int i=0;i<x;i++)
{
fi>>v[i];
}
}
int main()
{
short int M,N;
fi>>M>>N;
short int A[M],B[N],v[m(M,N)],i,j,k=0;
read(A,M);
read(B,N);
if (m(M,N)==M)
{
for(i=0;i<N;i++)
{
for (j=0;j<M;j++)
{
if (A[j]==B[i])
{
v[k]=A[j];
k++;
if (i>j) j=i;
else i=j;
}
}
}
}
else
{
for (i=0;i<M;i++)
{
for (j=0;j<N;j++)
{
if (A[i]==B[j])
{
v[k]=A[i];
k++;
if (i>j) j=i;
else i=j;
}
}
}
}
fo<<k<<"\n";
for (i=0;i<k;i++)
{
fo<<v[i]<<" ";
}
return 0;
}