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#include <cstdio>
using namespace std;
int v[1050], w[1050], dp[1050][1050], sol[1050];
int maxim(int a, int b) {
if(a > b)
return a;
return b;
}
int main() {
freopen("cmlsc.in", "r", stdin);
freopen("cmlsc.out", "w", stdout);
int n, m, ind = 0;
scanf("%d%d", &n, &m);
for(int i = 1; i <= n; ++ i) {
scanf("%d", &v[i]);
}
for(int i = 1; i <= m; ++ i) {
scanf("%d", &w[i]);
}
for(int i = 1; i <= n; ++ i) {
for(int j = 1; j <= m; ++ j) {
if(v[i] == w[j]) {
dp[i][j] = dp[i - 1][j - 1] + 1;
if(dp[i][j] > ind) {
sol[++ind] = v[i];
}
} else {
dp[i][j] = maxim(dp[i - 1][j], dp[i][j - 1]);
}
}
}
printf("%d\n", dp[n][m]);
for(int i = 1; i <= ind; ++ i) {
printf("%d ", sol[i]);
}
return 0;
}