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#include<bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int g[1030],d[1030],c[1030][1030],rs[1030],n,m,i,j,k=0;
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
{
fin>>g[i];
}
for(i=1;i<=m;i++)
{
fin>>d[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(g[i]==d[j]) c[i][j]=1+c[i-1][j-1];
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
}
}
for(i=n,j=m;i;)
{
if(g[i]==d[j])
{
rs[++k]=g[i];
i--;
j--;
}
else
if(c[i-1][j]<c[i][j-1])
j--;
else i--;
}
fout<<k<<"\n";
for(i=k;i;i--)
{
fout<<rs[i]<<" ";
}
return 0;
}