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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cmlsc.in"); ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],dp[1025][1025],sol[1025];
int Lmax(int n, int m)
{
int i,j;
for(i=1;i<=n;i++)
{
for(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]);
}
}
return dp[n][m];
}
int main()
{
f>>n>>m;
for(int i=0;i<=n;i++)
{
dp[0][i]=0;
dp[i][0]=0;
}
for(int i=1;i<=n;i++) f>>a[i];
for(int i=1;i<=m;i++) f>>b[i];
g<<Lmax(n,m)<<'\n';
int i,j,nr;
i=n;
j=m;
nr=0;
while(i>=1 || j>=1)
{
if (a[i]==b[j])
{
nr++;
sol[nr]=a[i];
i--;
j--;
}
else
{
if (dp[i-1][j]>dp[i][j-1])
{
i--;
}
else j--;
}
}
for(i=nr;i>=1;i--) g<<sol[i]<<' ';
return 0;
}