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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int dp[1025][1025], n, a[1025], m, b[1025];
int main()
{
cin>>n>>m;
for(int i=1;i<=n;i++)
cin>>a[i];
for(int i=1;i<=m;i++)
cin>>b[i];
for(int i=0;i<=n;i++)
dp[i][0]= 0;
for(int j=0;j<=m;j++)
dp[0][j] = 0;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i] == b[j])
dp[i][j] = dp[i-1][j-1] + 1;
else
dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
}
}
cout<<dp[n][m]<<"\n";
for(int i=1, k = 0;i<=m;i++)
if(dp[n][i] != k)
{
k++;
cout<<b[i]<<' ';
}
return 0;
}