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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
const int N=1030;
int a[N],b[N],s[N],d[N][N],n,m,i,j,k;
int main()
{
f>>n>>m;
for(i=1; i<=n; i++) f>>a[i];
for(i=1; i<=m; i++) f>>b[i];
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(a[i]==b[j])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
g<<d[n][m]<<'\n';
for(i=n,j=m,k=d[n][m]; d[i][j];)
if(a[i]==b[j])
s[k]=a[i],i--,j--,k--;
else if(d[i-1][j]>d[i][j-1])
i--;
else
j--;
for(i=1,k=d[n][m];i<=k;i++)
g<<s[i]<<' ';
return 0;
}