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#include <bits/stdc++.h>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int n,m,i,j,a[1027],b[1027],c[1027][1027],d[1027],poz;
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<=m;i++)
for(j=1;j<=n;j++)
if(a[j]==b[i])
c[i][j]=1+c[i-1][j-1];
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
g<<c[m][n]<<endl;
while(n!=0&&m!=0)
{
if(a[n]==b[m])
{
d[++poz]=a[n];
n--;
m--;
}
else
{
if(c[m-1][n]>c[m][n-1])
m--;
else
n--;
}
}
for(;poz>0;poz--)
g<<d[poz]<<" ";
return 0;
}