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#include<cstdio>
#define N 1024
#define M(a,b) (a<b?b:a)
int v[N],s[N][N],x[N],y[N],n,m,i,j;
int main()
{
freopen("cmlsc.in","r",stdin),freopen("cmlsc.out","w",stdout),scanf("%d%d",&n,&m);
for(i=0;i<n;i++)
scanf("%d",x+i);
for(i=0;i<m;i++)
scanf("%d",y+i);
for(i=0;i<n;i++)
for(j=0;j<m;j++)
s[i][j]=(x[i]==y[j]?1+s[i-1][j-1]:M(s[i][j-1],s[i-1][j]));
while(n>=0)
if(x[n-1]==y[m-1])
v[++v[0]]=x[n-1],m--,n--;
else
s[n-2][m-1]<s[n-1][m-2]?m--:n--;
printf("%d\n",v[0]);
for(i=v[0];i;i--)
printf("%d ",v[i]);
}