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#include<iostream>
#include<fstream>
#include<algorithm>
using namespace std;
ifstream intrare;
ofstream iesire;
int main()
{
int n,m, v1[1025], v2[1025], r[1025], M[1025][1025];
intrare.open("cmlsc.in");
intrare>>n>>m;
for(int i=1;i<=n;i++)
intrare>>v1[i];
for(int i=1;i<=m;i++)
intrare>>v2[i];
intrare.close();
for(int i=0;i<=n;i++)
M[i][0] = 0;
for(int j=0;j<=m;j++)
M[0][j] = 0;
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
if(v1[i] == v2[j])
M[i][j] = M[i-1][j-1]+1;
else
M[i][j] = max(M[i-1][j], M[i][j-1]);
iesire.open("cmlsc.out");
iesire<<M[n][m]<<"\n";
int ri=M[n][m];
for(int i=n, j=m; i; )
if(v1[i]==v2[j])
{
r[ri--]=v1[i];
i--;j--;
}
else if(M[i-1][j]>M[i][j-1])
i--;
else j--;
for(int i=1;i<=M[n][m];i++)
iesire<<r[i]<<" ";
iesire.close();
return 0;
}