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//#include <iostream>
#include <fstream>
using namespace std;
ifstream cin("ssm.in");
ofstream cout("ssm.out");
int n,i,a[1030],dp[1030][1030],k,b[1030],nr,j,m,v[1030];
int main()
{
cin>>n>>m;
for(i=1;i<=n;i++)cin>>a[i];
for(j=1;j<=m;j++)cin>>b[j];
nr=0;
k=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++) dp[i][j]==0;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(a[i]==b[j]){nr++;
k++;
v[k]=b[j];}
dp[i][j]=nr;
}
}
cout<<dp[n][m]<<'\n';
for(k=1;k<=nr;k++)cout<<v[k]<<" ";
return 0;
}