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#include <fstream>
#define nmax 1030
using namespace std;
int n, m, a[nmax], b[nmax], dp[nmax][nmax], rez[nmax];
fstream f1("cmlsc.in", ios::in);
fstream f2("cmlsc.out", ios::out);
int main()
{
int i, j, k;
f1>>n>>m;
for(i=1; i<=n; i++)
f1>>a[i];
for(i=1; i<=m; i++)
f1>>b[i];
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
if(a[i]==b[j]) dp[i][j]=dp[i-1][j-1]+1;
else dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
f2<<dp[n][m]<<"\n";
i=n; j=m;
k=0;
while((i>=1)&&(j>=1))
{
if(a[i]==b[j]) {k++;rez[k]=a[i]; i--; j--;}
else
{
if(i==1) j--;
else if(j==1) i--;
else if(dp[i-1][j]> dp[i][j-1]) i--;
else j--;
}
}
for(i=k; i>=1; i--)
f2<<rez[i]<<' ';
return 0;
}