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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, A[1030], B[1030], D[1030][1030];
stack<int> sol;
int main()
{
fin >> n >> m;
for(int i=1; i<=n; i++)
fin >> A[i];
for(int i=1; i<=m; i++)
fin >> B[i];
for(int i=1; i<=n; i++)
{
for(int j=1; j<=m; j++)
{
if(A[i] == B[j]) D[i][j] = D[i-1][j-1] + 1;
else D[i][j] = max(D[i-1][j], D[i][j-1]);
}
}
for(int i=n, j=m; i;)
{
if(A[i] == B[j]){sol.push(i);i--; j--;}
else if(D[i-1][j] < D[i][j-1]) j--;
else i--;
}
fout<<D[n][m]<<'\n';
while(!sol.empty())
{
fout<<A[sol.top()]<<' ';
sol.pop();
}
return 0;
}