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#include<fstream>
using namespace std;
#define N 1025
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
unsigned char v[N],s[N][N],x[N],y[N];
short int n,m,i,j;
int main() {
f>>n>>m;
for(i=1;i<=n;i++)
f>>x[i];
for(i=1;i<=m;i++)
f>>y[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
s[i][j]=(x[i]==y[j]?1+s[i-1][j-1]:(s[i][j-1]<s[i-1][j]?s[i-1][j]:s[i][j-1]));
while(n)
if(x[n]==y[m])
v[++v[0]]=x[n--],m--;
else
s[n-1][m]<s[n][m-1]?m--:n--;
g<<v[0]<<'\n';
for(i=v[0];i;i--)
g<<v[i]<<' ';
return 0;
}