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#include <bits/stdc++.h>
using namespace std;
#define TITLE "cmlsc"
#define ll long long
#define MaxN 1034
ifstream f (TITLE".in");
ofstream g (TITLE".out");
int dp[MaxN][MaxN];
int A[MaxN],B[MaxN];
int path(int i, int j, int steps)
{
if(steps==0)
return 0;
if(A[i]==B[j])
{
path(i-1, j-1, steps-1);
g<<A[i]<<' ';
}
else
{
if(dp[i-1][j]>dp[i][j-1])
path(i-1,j,steps);
else
path(i,j-1,steps);
}
return 0;
}
int solve()
{
int n,m;
f>>n>>m;
for(int i=1; i<=n; i++)
f>>A[i];
for(int i=1; i<=m; i++)
f>>B[i];
for(int i=1; i<=n; i++)
{
for(int 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]);
}
}
g<<dp[n][m]<<'\n';
path(n,m,dp[n][m]);
return 0;
}
int main()
{
solve();
return 0;
}