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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
int n, m, a[1025], b[1025], c[1025], S = 0;
cin >> n >> m;
for(int i = 0; i < n; i++)
{
cin >> a[i];
}
for(int i = 0; i < m; i++)
{
cin >> b[i];
}
if(n < m)
{
for(int i = 0; i < n; i++)
{
for(int j = 0; j < m; j++)
{
if(a[i] == b[j])
{
c[S] = a[i];
S++;
}
}
}
}
else
{
for(int i = 0; i < m; i++)
{
for(int j = 0; j < n; j++)
{
if(b[i] == a[j])
{
c[S] = b[i];
S++;
}
}
}
}
cout << S << endl;
for(int i = 0; i < S; i++)
{
cout << c[i] << " ";
}
cout << endl;
}