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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int mat[1024][1024], v1[1024], v2[1024], i,j, n, m,sir[1024],k;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>v1[i];
for(j=1;j<=m;j++)
f>>v2[j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(v1[i]==v2[j])
mat[i][j]=mat[i-1][j-1]+1;
else
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
g<<mat[n][m]<<'\n';
for (i=n,j=m; i; )
if (v1[i]==v2[j])
sir[++k] = v1[i], --i, --j;
else if (mat[i-1][j]<mat[i][j-1])
--j;
else
--i;
for(i=k;i>0;i--)
g<<sir[i]<<" ";
return 0;
}