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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int main(){
int a[100],b[100],c[100][100],n,m,i,j;
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<=m;i++)
c[0][i]=0;
for(i=1;i<=n;i++)
c[i][0]=0;
///fac tablou
for(i=1;i<=n;i++)
for(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]);
int lungime=c[n][m];
/// frec tablou
g<<lungime<<'\n';
i=n; j=m;
while(i>0 && j>0)
if(a[i]==b[j]){
g<<a[i]<<" ";
i--; j--;
}
else{
if(c[i-1][j]>c[i][j-1]) i--;
else j--;
}
return 0;
}