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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1050],b[1050],c[1050],n,m;
int mat[1050][1050];
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++){
f>>a[i];
}
for(int i=1;i<=m;i++){
f>>b[i];
}
for(int i=1;i<=n;i++){
for(int j=1;j<=m;j++){
if(b[j]==a[i])mat[i][j]=mat[i-1][j-1]+1;
else mat[i][j]=max(mat[i][j-1],mat[i-1][j]);
}
}
int i=n,j=m;
g<<mat[n][m]<<"\n";
while(i>0&&j>0){
if(a[i]==b[j]){c[++c[0]]=a[i];j--;i--;}
else if(mat[i-1][j]>mat[i][j-1])i--;
else j--;
}
for(i=c[0];i>=1;i--)g<<c[i]<<" ";
return 0;
}