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#include <fstream>
using namespace std;
int n,m,i,j,x,y,v[1050],w[1050],r[1050],d[1050][1050];
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
f>>n>>m;
for(i=1; i<=n; i++)
{
f>>v[i];
}
for(i=1; i<=m; i++)
{
f>>w[i];
}
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
d[i][j]=max(d[i-1][j],d[i][j-1]);
if(v[i]==w[j]) d[i][j]=max(d[i][j],d[i-1][j-1]+1);
}
g<<d[n][m]<<'\n';
x=n;
y=m;
i=d[n][m];
while(i)
{
if(v[x]==w[y]&&d[x][y]==d[x-1][y-1]+1)
{
r[i]=v[x];
i--;
x--;
y--;
}
else if(d[x-1][y]==d[x][y]) x--;
else y--;
}
for(i=1; i<=d[n][m]; i++)
{
g<<r[i]<<" ";
}
f.close(); g.close();
return 0;
}