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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m,a[1026],b[1026],dp[1026][1026];
void f(int x,int y,int nr)
{
if(nr==0)
return ;
else
if(a[x]==b[y])
{
f(x-1,y-1,nr-1);
cout<<a[x]<<" ";;
}
else
{
if(dp[x][y-1]>dp[x-1][y])
f(x,y-1,nr);
else
f(x-1,y,nr);
}
}
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>a[i];
for(int j=1;j<=m;j++)
cin>>b[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
cout<<dp[n][m]<<'\n';
f(n,m,dp[n][m]);
return 0;
}