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#include <fstream>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int a[1030],b[1030],ans[1030];
int m,n,v[1030][1030],i,j,val,x,y;
int main ()
{
fin>>n>>m;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=m;i++)
fin>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
v[i][j]=max(v[i-1][j],v[i][j-1])+1;
else
v[i][j]=max(v[i-1][j],v[i][j-1]);
fout<<v[n][m]<<'\n';
val=v[n][m];
x=n; y=m;
while(val>0)
{
while(v[x-1][y]==val)
x--;
while(v[x][y-1]==val)
y--;
ans[val]=a[x];
x--; y--;
val--;
}
for(i=1;i<=v[n][m];i++)
fout<<ans[i]<<' ';
/*
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
fout<<v[i][j]<<' ';
fout<<'\n';
}
*/
}