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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int i,j,bst,N,M;
int A[1025],B[1025],cmlsc[1025];
int Dp[1024][1024];
int main()
{
f>>N>>M;
for(i=1; i<=N; i++)
f>>A[i];
for(j=1; j<=M; j++)
f>>B[j];
for(i=1; i<=N; i++)
for(j=1; j<=M; j++)
{
if(A[i]==B[j])
Dp[i][j]=1+Dp[i-1][j-1];
else
Dp[i][j]=max(Dp[i-1][j],Dp[i][j-1]);
}
i=N;
j=M;
while(i>0 && j>0)
{
if(A[i]==B[j])
{
cmlsc[bst++]=A[i];
i--;
j--;
}
else
{
if(Dp[i-1][j]<Dp[i][j-1])
j--;
else
i--;
}
}
g<<bst<<"\n";
for(i=bst-1; i>=0; i--)
g<<cmlsc[i]<<" ";
return 0;
}