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#include <iostream>
#include<fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1000],b[1000];
void citire()
{f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int i=1;i<=m;i++)
f>>b[i];
}
int secv[1000][1000];
int numere[100],k=1;
int main()
{citire();
int i,j;
for(i=0;i<=n;i++)
{secv[0][i]=0;
}
for(i=0;i<=m;i++)
secv[i][0]=0;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j])
{secv[i][j]=1+secv[i-1][j-1];
if(secv[i][j]!=0)
{
numere[k++]=secv[i][j];
}
}
else
{secv[i][j]=max(secv[i-1][j],secv[i][j-1]);
if(secv[i][j]!=0)
{
numere[k++]=secv[i][j];
}
}
}
k--;
g<<secv[n][m]<<endl;
for(i=1;i<=k;i++)
g<<numere[i]<<" ";
return 0;
}