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#include <bits/stdc++.h>
using namespace std;
int c[1024][1024];
int n,m,a[1025],b[1025],sol[1025],k;
ifstream input("cmlsc.in");
ofstream output("cmlsc.out");
int main()
{
input>>n>>m;
for(int i=1;i<=n;++i)
input>>a[i];
for(int j=1;j<=m;++j)
input>>b[j];
for(int i=1;i<=n;++i)
for(int j=1;j<=m;++j)
if(a[i] == b[j]) c[i][j] = c[i-1][j-1] + 1;
else c[i][j] = max(c[i-1][j],c[i][j-1]);
for(int i=1;i<=n;++i)
{
for(int j=1;j<=m;++j)
cout<<c[i][j]<<" ";
cout<<'\n';
}
output<<c[n][m]<<'\n';
int i=n,j=m;
while(i)
{
if(a[i]==b[j])
{
sol[++k] = a[i];
--i;
--j;
}
else
if(c[i-1][j] > c[i][j-1]) --i;
else --j;
}
for(int i=k;k>=1;--k)
output<<sol[k]<<" ";
input.close();
output.close();
return 0;
}