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#include <fstream>
using namespace std;
ifstream cin("cmlsc.in");
ofstream cout("cmlsc.out");
int n,m,x,a[1030],b[1030],dp[1030][1030],y,v[1030],c,mx,i,j;
int main()
{
cin>>n>>m;
for(i=1; i<=n; i++) cin>>a[i];
for(i=1; i<=m; i++) cin>>b[i];
for(i=1; i<=n; i++)
{
for(j=1;j<=m;j++)
{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(a[i]==b[j]) dp[i][j]=dp[i-1][j-1]+1;
}
}
mx=dp[n][m];
x=n;
y=m;
cout<<mx<<'\n';
while(mx>0)
{
if(a[x]==b[y])
{v[mx]=a[x];
mx--;
x--;
y--;}
else
{
if(dp[x-1][y]==mx) x--;
else y--;
}
}
for(i=1;i<=dp[n][m];i++)
cout<<v[i]<<" ";
return 0;
}