#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < int(n); i++)
#define rep1(i,n) for (int i = 1; i <= int(n); i++)
#define repR(i,n) for (int i = int(n)-1; i >= 0; i--)
#define rep1R(i,n) for (int i = int(n); i >= 1; i--)
#define loop(i,a,B) for (int i = a; i B; i++)
#define loopR(i,a,B) for (int i = a; i B; i--)
#define all(x) (x).begin(), (x).end()
#define allR(x) (x).rbegin(), (x).rend()
#define eb emplace_back
#define mp make_pair
#define fst first
#define snd second
#ifdef LOCAL
#define dump(...) cerr << "[" << __LINE__ << ":" << __FUNCTION__ << "] ", my_dmp(#__VA_ARGS__, __VA_ARGS__)
void my_dmp(const char*) { cerr << endl; }
template <class T, class... U> void my_dmp(const char *s, T const& x, U const& ...y) { const char *o = "({[", *e = "]})"; for (int i = 0; *s != '\0'; cerr << *s++) { if (count(o,o+3,*s)) i++; if (count(e,e+3,*s)) i--; if (!i && *s == ',') break; } cerr << " = " << x; if (*s == ',') cerr << ", ", s++; my_dmp(s, y...); }
#else
#define dump(...)
#endif
using ll = long long;
using ld = long double;
#define int ll
template <class T> using pque_max = priority_queue<T>;
template <class T> using pque_min = priority_queue<T, vector<T>, greater<T> >;
template <class T, class = typename T::iterator, class = typename enable_if<!is_same<T, string>::value>::type>
ostream& operator<<(ostream& os, T const& v) { os << "{"; for (auto const& x : v) os << " " << x; return os << " }"; }
template <class T> istream& operator>>(istream& is, vector<T>& v) { for (auto& x : v) is >> x; return is; }
template <class T, class S> ostream& operator<<(ostream& os, pair<T,S> const& p) { return os << "(" << p.first << ", " << p.second << ")"; }
template <class T, class S> istream& operator>>(istream& is, pair<T,S>& p) { return is >> p.first >> p.second; }
struct my_Init { my_Init() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); } } my_init;

template <class T, size_t d, class = typename enable_if<(d == 0)>::type> constexpr auto make_v(T const& x = {}) { return x; }
template <class T, size_t d, class... U, class = typename enable_if<(d > 0)>::type> constexpr auto make_v(size_t n, U... x) { auto val = make_v<T,d-1>(x...); return vector<decltype(val)>(n, move(val)); }
template <class T> void quit(T const& x) { cout << x << endl; exit(0); }
template <class T> constexpr bool chmin(T& x, T const& y) { if (x > y) { x = y; return true; } return false; }
template <class T> constexpr bool chmax(T& x, T const& y) { if (x < y) { x = y; return true; } return false; }
template <class It> constexpr auto sumof(It b, It e) { return accumulate(b,e,typename iterator_traits<It>::value_type{}); }
const ll INF = (1LL<<62)-1; // ~ 4.6e18
////////////////////////////////

int32_t main() {
    string s,t; cin >> s >> t;
    int n = s.size(), m = t.size();
    auto dp = make_v<int,2>(n+1,m+1,0);
    auto pi = make_v<int,2>(n+1,m+1,-1);
    auto pj = make_v<int,2>(n+1,m+1,-1);
    auto ch = make_v<int,2>(n+1,m+1,0);
    rep1 (i,n) rep1 (j,m) {
        if (chmax(dp[i][j], dp[i-1][j])) pi[i][j] = i-1, pj[i][j] = j;
        if (chmax(dp[i][j], dp[i][j-1])) pi[i][j] = i, pj[i][j] = j-1;
        if (s[i-1] == t[j-1] && chmax(dp[i][j], dp[i-1][j-1] + 1)) {
            ch[i][j] = 1;
            pi[i][j] = i-1, pj[i][j] = j-1;
        }
    }

    vector<int> ans;
    for (int i = n, j = m; i >= 0 && j >= 0; tie(i,j) = mp(pi[i][j], pj[i][j])) {
        if (ch[i][j]) ans.eb(s[i-1]);
    }
    reverse(all(ans));
    for (char c : ans) cout << c;
    cout << endl;
}


Measured memory_bytes: 282112