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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int m,n,i,j,k=0,t;
f>>m>>n;
int a[m],b[n],c[1024];
for(i=0;i<m;i++)
f>>a[i];
for(j = 0;j < n;j++)
f>>b[j];
for(i = 0; i < m; i++)
{t = 1;
{for(j = 0; j < n && t==1; j++)
if(a[i] == b[j]) {c[k++]=a[i];
t =0;}}}
g<<k<<endl;
for(i=0;i < k; i++)
g<<c[i]<<" ";
return 0;
}