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#include <cstdio>
#include <algorithm>
using namespace std;
int a[2000],b[2000],d[2000][2000],rasp[2000];
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
int n,m,i,j;
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++)
scanf("%d",&a[i]);
for(j=1;j<=m;j++)
scanf("%d",&b[j]);
for(i=0;i<=n;i++)
{
d[i][0]=0;
d[i][m+1]=0;
}
for(i=0;i<=m;i++)
{
d[0][i]=0;
d[n+1][i]=0;
}
for(i=1;i<=n;i++)
for(j=1;j<=m;++j)
{
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
printf("%d\n",d[n][m]);
i=n;
j=m;
while(i>0&&j>0)
{
if(a[i]==b[j])
{
rasp[d[i][j]]=a[i];
i--;
j--;
}
else
{
if(d[i][j-1]==d[i][j])
j--;
else
i--;
}
}
for(i=1;i<=d[n][m];i++)
printf("%d ",rasp[i]);
return 0;
}