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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int main()
{
int DP[100][100],A[1025],B[1025],n,m;
f>>n>>m;
for(int i=1; i<=n; i++)
f>>A[i];
for(int i=1; i<=m; i++)
f>>B[i];
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][j-1],DP[i-1][j]); }
g<<DP[n][m]<<endl;
int i=n,k=0,j=m,V[1025];
while(i>0 && j>0 && DP[i][j]>0)
{
if(A[i]==B[j])
{
V[++k]=A[i];
i--;
j--;
}
else
{
if(DP[i-1][j]>DP[i][j-1])
i--;
else
j--;
}
}
for(i=k;i>=1;i--)
g<<V[i]<<" ";
return 0;
}