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#include <bits/stdc++.h>
#define Dim 1030
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int N,M,A[Dim],B[Dim],dp[Dim][Dim];
int writtte[Dim],cnt,a,b;
int main()
{
f>>N>>M;
for(int i=1;i<=N;i++) f>>A[i];
for(int j=1;j<=M;j++) f>>B[j];
dp[0][0]=0;
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-1][j],dp[i][j-1]);
g<<dp[N][M]<<'\n';
a=N,b=M;
while(a>0&&b>0)
{
if(A[a]==B[b])
{
writtte[++cnt]=A[a];
a--;
b--;
}
else
if(dp[a][b]==dp[a-1][b]) a--;
else
if(dp[a][b]==dp[a][b-1]) b--;
}
for(int i=cnt;i>=1;i--) g<<writtte[i]<<" ";
return 0;
}