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#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int v[1030], u[1030], a[1030][1030], sol[1030], vizv[1030], vizu[1030];
int main()
{
int n, m, i, j, k;
f>>n;
f>>m;
for(i=1; i<=n; i++)
f>>v[i];
for(i=1; i<=m; i++)
f>>u[i];
for(i=0; i<=m; i++)
for(j=0; j<=n; j++)
{
if(i==0 || j==0)
a[i][j]=0;
}
k=1;
for(i=1; i<=m; i++)
for(j=1; j<=n; j++)
{
if((v[j]==u[i]) && (vizv[j]==0) && (vizu[i]==0))
{
a[i][j]=1+a[i-1][j-1];
sol[k]=v[j]; k++;
vizv[j]=1; vizu[i]=1;
cout<<vizv[j]<<" "<<vizu[i]<<"\n";
}
else
{if(a[i-1][j]>a[i][j-1])
a[i][j]=a[i-1][j];
else a[i][j]=a[i][j-1];}
}
g<<k-1<<"\n";
for(i=1; i<=k-1; i++)
g<<sol[i]<<" ";
return 0;
}