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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m;
int v[10251];
int w[10251];
int dp[1030][1030];
int main()
{
fin >> n >> m;
for(int i = 1; i <= n; i ++)
{
fin >> v[i];
}
for(int i = 1; i <= m; i ++)
{
fin >> w[i];
}
for(int i = 1; i <= n; i ++)
{
for(int j = 1; j <= m; j ++)
{
if(v[i] == w[j])
{
dp[i][j] = max(dp[i][j], dp[i-1][j-1] + 1);
}
else
{
dp[i][j] = max(dp[i-1][j], dp[i][j-1]);
}
}
}
fout << dp[n][m] << '\n';
stack<int> stiva;
int k = dp[n][m];
while(k)
{
if(v[n] == w[m])
{
stiva.push(v[n]);
n--;
m--;
k--;
}
else
{
if(dp[n][m] == dp[n-1][m])
{
n--;
}
else
{
m--;
}
}
}
while(!stiva.empty())
{
fout << stiva.top() << ' ';
stiva.pop();
}
fout << '\n';
return 0;
}