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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int i,j,c,n,m,nr,a[1030],b[1030],d[1030][1030],sol[1030];
int maxim(int x, int y){
if(x>y)
return x;
return y;
}
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=maxim(d[i][j-1],d[i-1][j]);
g<<d[n][m]<<'\n';
i=n;j=m;
while(d[i][j]!=0)
if(a[i]==b[j]){
sol[++nr]=a[i];
i--;j--;
}
else{
c=maxim(d[i][j-1],d[i-1][j]);
if(c>d[i][j-1]){
i--;
}
else
{
j--;
}
}
for(i=nr;i>=1;i--)
g<<sol[i]<<" ";
return 0;
}