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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, v1[260], v2[260], sir[260];
int dp[260][260];
void ciitre()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>v1[i];
for(int j=1;j<=m;j++)
fin>>v2[j];
}
void programaredinamica()
{
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(v1[i]==v2[j])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
fout<<dp[n][m]<<'\n';
}
void drum()
{
int cnt=0, i,j;
for( i=n, j=m; i; )
{
if(v1[i]==v2[j])
sir[++cnt]=v1[i], i--, j--;
else
if(dp[i-1][j]<dp[i][j-1])
j--;
else
i--;
}
for(int k=cnt;k>=1;k--)
fout<<sir[k]<<" ";
}
int main()
{
ciitre();
programaredinamica();
drum();
}