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#include <bits/stdc++.h>
#define MAX 1024
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int maxim(int a,int b){
if(a>b)return a;
else return b;
}
int A[MAX],B[MAX],C[MAX][MAX],D[MAX],M,N,m;
int main()
{
f>>M>>N;
for(int i=1;i<=M;i++)
f>>A[i];
for(int i=1;i<=N;i++)
f>>B[i];
for(int i=1;i<=M;i++)
for(int j=1;j<=N;j++)
if(A[i]==B[j])
C[i][j]=1+C[i-1][j-1];
else
C[i][j]=maxim(C[i-1][j],C[i][j-1]);
int i=M,j=N;
while(i){
if(A[i]==B[j]){
D[++m]=A[i];
i--;
j--;
}else if(C[i-1][j]<C[i][j-1])
j--;
else
i--;
}
g<<m<<'\n';
for(int i=m;i>=1;i--)
g<<D[i]<<" ";
return 0;
}