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#include<cstdio>
#include<algorithm>
using namespace std;
int n,m,v1[1030],v2[1030],v[1030],a[1030][1030];
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++)
{
scanf("%d",&v1[i]);
}
for(int i=1;i<=m;i++)
{
scanf("%d",&v2[i]);
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if (v1[i]!=v2[j])
{
a[i][j]=max(a[i-1][j],a[i][j-1]);
}
else
{
a[i][j]=a[i-1][j-1]+1;
}
}
}
printf("%d \n",a[n][m]);
int elemente=0,x=n,y=m;
while (elemente<a[n][m])
{
if (v1[x]==v2[y])
{
v[++elemente]=v1[x];
x--;
y--;
}
else
{
if (a[x-1][y]<a[x][y-1]) y--;
else x--;
}
}
for(int i=elemente;i>=1;i--) printf("%d ",v[i]);
printf("\n");
return 0;
}