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#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, i, j, dp[1025][1025], a[1025], b[1025], k, v[1025];
int main()
{
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>a[i];
for(i=1; i<=m; i++)
fin>>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-1][j], dp[i][j-1]);
fout<<dp[n][m]<<'\n';
i=n, j=m;
while(i>=1 && j>=1)
{
if(a[i]==b[j])
{
v[++k]=a[i];
i--;
j--;
}
else
if(dp[i][j-1]>dp[i-1][j])
j--;
else
i--;
}
for(i=k; i>=1; i--)
fout<<v[i]<<" ";
return 0;
}