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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],i,j,x[1025][1025],y[1025],k;
int main()
{ f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{ if(a[i]==b[j])
x[i][j]=x[i-1][j-1]+1;
else
if(x[i-1][j]>x[i][j-1])
x[i][j]=x[i-1][j];
else
x[i][j]=x[i][j-1];
}
i=n; j=m;
while(i>0 || j>0)
{ if(a[i]==b[j])
{ y[++k]=a[i];
i--; j--;
}
else
if(x[i-1][j]>x[i][j-1]) i--;
else
j--;
}
g<<k<<'\n';
for(i=k;i>=1;i--)
g<<y[i]<<" ";
return 0;
}