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#include<bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
#define maxmn 1025
int M, N, A[maxmn], B[maxmn], D[maxmn][maxmn], P[maxmn], i, j, k;
int main()
{
fin>>M>>N;
for(i=1;i<=M;i++)
{
fin>>A[i];
}
for(i=1;i<=N;i++)
{
fin>>B[i];
}
for(i=1;i<=M;i++)
{
for(j=1;j<=N;j++)
{
if(A[i]==B[j])
{
D[i][j]=1+D[i-1][j-1];
}
else
{
D[i][j]=max(D[i][j-1], D[i-1][j]);
}
}
}
i=M; j=N;
while(i&&j)
{
if(A[i]==B[j])
{
P[++k]=A[i];
i--;j--;
}
else
{
if(D[i-1][j]<D[i][j-1])
{
j--;
}
else
{
i--;
}
}
}
fout<<k<<'\n';
for(i=k;i>=1;i--)
{
fout<<P[i]<<' ';
}
return 0;
}