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#include <cstdio>
using namespace std;
int v1[1025];
int v2[1025];
int mat[1025][1025];
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
int m,n,i,j,max,cnt;
max=0;
scanf("%d%d",&m,&n);
for(i=1;i<=m;i++)
scanf("%d",&v1[i]);
for(i=1;i<=n;i++)
scanf("%d",&v2[i]);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(v1[j]==v2[i]){
mat[i][j]=mat[i-1][j-1]+1;
if(mat[i][j]>max)
max=mat[i][j];
}
else
mat[i][j]=max;
}
printf("%d\n",max);
cnt=max;
max=0;
for(i=1;i<=n && cnt>0;i++)
for(j=1;j<=m;j++)
{
if(mat[i][j]>max)
{
max=mat[i][j];
printf("%d ",v2[i]);
cnt--;
}
}
return 0;
}