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#include <fstream>
#include <iostream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int mat[1025][1025],m,n,Final[1025],v1[1025],v2[1025],i,j;
int Max(int a,int b) {
if(a>b)
return a;
return b;
}
int main() {
fin>>n>>m;
for(i=1; i<=n; i++) {
fin>>v1[i];
}
for(i=1; i<=m; i++) {
fin>>v2[i];
}
for(i=1; i<=n; i++) {
for(j=1; j<=m; j++) {
if(v1[i]==v2[j]) {
mat[i][j]=mat[i-1][j-1]+1;
} else {
mat[i][j]=Max(mat[i-1][j],mat[i][j-1]);
}
}
}
int aux=0;
i=n;
j=m;
while(mat[i][j]>0) {
while(mat[i][j-1]==mat[i][j]) {
j--;
}
while(mat[i-1][j]==mat[i][j]) {
i--;
}
Final[++aux]=v1[i];
i--;
}
fout<<mat[n][m]<<'\n';
for(i=aux; i>=1; i--) {
fout<<Final[i]<<' ';
}
return 0;
}