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#include <fstream>
#include <cassert>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int m,n,i,j,mx,a[1050],b[1050],dp[1050][1050], sol[1050],k;
int main()
{
cin>>n>>m;
for(i=1;i<=n;i++)
cin>>a[i];
for(i=1;i<=m;i++)
cin>>b[i];
for(i=1;i<=n;i++)
for(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][j-1],dp[i-1][j]);
}
i=n;
j=m;
while(i>=1 && j>=1)
{
if(dp[i][j]==dp[i-1][j-1]+1)
{
sol[++k]=a[i];
i--;j--;
}
else if(dp[i-1][j]==dp[i][j])
{
i--;
}
else if(dp[i][j]==dp[i][j-1])j--;
}
assert(dp[n][m]==0);
cout<<dp[n][m]<<endl;
for(i=k;i>=1;i--)
cout<<sol[i]<<" ";
return 0;
}