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