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#include<bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1026],b[1026],n,m,dp[1026][1026],nou[1026];
int main()
{
int i,j,k=0;
f>>m>>n;
for(i=1;i<=m;i++)
f>>a[i];
for(i=1;i<=n;i++)
f>>b[i];
dp[0][0]=0;
for(i=1;i<=m;i++)
{
for(j=1;j<=n;j++)
{
if(a[i]==b[j])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
g<<dp[m][n]<<'\n';
for(i=m,j=n; i>0; )
{
if(a[i]==b[j])
{
k++;
nou[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<<nou[i]<<" ";
return 0;
}