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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cmlsc.in"); ofstream g("cmlsc.out");
int n, m, a[1030], b[1030], dp[1030][1030], sol[1030];
int main(){
int i,j;
f>>n>>m;
dp[0][0] = 0;
for(i = 1; i <= n; ++i) {
dp[i][0] = 0;
f>>a[i];
}
for(i = 1; i <= m; ++i) {
dp[0][i] = 0;
f>>b[i];
}
for(i = 1; i <= n; ++i) {
for(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]);
}
}
}
i = n;
j = m;
g<<dp[n][m]<<'\n';
int nr = 0;
while(i >= 1 || j >= 1) {
if (a[i] == b[j]) {
++nr;
sol[nr] = a[i];
--i;
--j;
}
else {
if (dp[i-1][j] >= dp[i][j-1]) {
--i;
}
else {
--j;
}
}
}
for(i = nr; i >= 1; --i) {
g<<sol[i]<<' ';
}
return 0;
}