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#include <iostream>
#include <stdio.h>
int mat[1030][1030],m,n;
int a[1030],b[1030],sol[1030];
using namespace std;
void citire()
{
freopen("cmlsc.in","r",stdin);
scanf("%d %d",&n,&m);
for(int i=1;i<=n;i++)
scanf("%d",&a[i]);
for(int j=1;j<=m;j++)
scanf("%d",&b[j]);
}
void cmlsc()
{
freopen("cmlsc.out","w",stdout);
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(a[i]==b[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
printf("%d\n",mat[n][m]);
int i=n,j=m,u=0;
while(i && j)
{
if(a[i]==b[j])
{
sol[u++]=a[i];
i--,j--;
}
else
if(mat[i-1][j]<mat[i][j-1])
j--;
else
i--;
}
for(int i=u-1;i>=0;i--)
printf("%d ",sol[i]);
}
int main()
{
citire();
cmlsc();
return 0;
}