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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1050],b[1050],i,nr,j,n,m,mat[1050][1050],v[1050*1050];
int main()
{
fin>>n>>m;
for(i=1;i<=n;++i)
fin>>a[i];
for(i=1;i<=m;++i)
fin>>b[i];
if(a[1]==b[1]) mat[1][1]=1;
for(i=1;i<=n;++i)
for(j=1;j<=m;++j)
if(a[i]==b[j])
mat[i][j]=1+mat[i-1][j-1];
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
fout<<mat[n][m]<<'\n';
i=n; j=m;
while(i>0 && j>0)
{
if(mat[i][j]==mat[i-1][j-1]+1)
{
v[++nr]=a[i];
i--; j--;
}
else if(mat[i][j-1]>mat[i-1][j])
j--;
else i--;
}
for(i=nr;i>=1;--i)
fout<<v[i]<<' ';
return 0;
}