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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
int a[1025],b[1025],m,n,ct=0,i,j,x,c[260]={0};
fin>>m>>n;
for (i=1;i<=m;i++)
fin>>a[i];
for (i=1;i<=n;i++)
fin>>b[i];
for(i=1;i<=m;i++)
for (j=1;j<=n;j++)
if (a[i]==b[j])
{
ct++;
c[a[i]]++;
x=b[j];
}
fout<<ct<<"\n";
for (i=0;i<=x;i++)
if (c[i]!=0)
fout<<i<<" ";
return 0;
}