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#include <iostream>
#include <fstream>
using namespace std;
int M,N;
int m(int a,int b)
{
if (a>=b) return a;
return b;
}
int main()
{
int v1[M],v2[N],v3[m(M,N)],k=0,i,j,p=0;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>M>>N;
for (i=0;i<M;i++)
{
f>>v1[i];
}
for (j=0;j<N;j++)
{
f>>v2[j];
}
for (i=0;i<M;i++)
{
for (j=0;j<N;j++)
{
if (v1[i]==v2[j])
{
if (p==0)
{
v3[p]=v1[i];
p++;
k++;
}
else if (v1[i]>v3[p-1])
{
v3[p]=v1[i];
p++;
k++;
}
}
}
}
g<<k<<"\n";
for (p=0;p<k;p++)
{
g<<v3[p]<<" ";
}
f.close(),g.close();
return 0;
}