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#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define INF numeric_limits<int>::max()
#define int64 long long
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
int a[1025],b[1025],dp[1025][1025],n,m;
void afis(int x,int y)
{
if(dp[x][y]!=0)
{
if(a[x]==b[y])
{
afis(x-1,y-1);
out<<a[x]<<' ';
}
else if(dp[x-1][y]==dp[x][y])afis(x-1,y);
else afis(x,y-1);
}
}
int main()
{
in>>n>>m;
for(int i=1;i<=n;i++)
in>>a[i];
for(int i=1;i<=m;i++)
in>>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-1][j],dp[i][j-1]);
out<<dp[n][m]<<'\n';
afis(n,m);
return 0;
}