#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
#include<bits/stdc++.h>
using namespace std;
using namespace __gnu_pbds;


typedef tree<int, null_type, less_equal<int>, rb_tree_tag,
             tree_order_statistics_node_update>
    ordered_set;


#define pf                  printf
#define sf(a)               scanf("%d",&a)
#define sfl(a)              scanf("%lld",&a)
#define sff(a,b)            scanf("%d %d",&a,&b)
#define sffl(a,b)           scanf("%lld %lld",&a,&b)
#define sfff(a,b,c)         scanf("%d %d %d",&a,&b,&c)
#define sfffl(a,b,c)        scanf("%lld %lld %lld",&a,&b,&c)
#define sffff(a,b,c,d)      scanf("%d %d %d %d",&a,&b,&c,&d)
#define sffffl(a,b,c,d)     scanf("%lld %lld %lld %lld",&a,&b,&c,&d)
#define sfffff(a,b,c,d,e)   scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)
#define sfffffl(a,b,c,d,e)  scanf("%lld %lld %lld %lld %lld",&a,&b,&c,&d,&e)
#define sfc(a)              scanf("%c",&a)
#define pii                 pair<int,int>
#define ms(a,b)             memset(a,b,sizeof(a))
#define pb(a)               push_back(a)
#define pbp(a,b)            push_back({a,b})
#define db                  double
#define ft                  float
#define ll                  long long
#define ull                 unsigned long long
#define pii                 pair<int,int>
#define ff                  first
#define ss                  second
#define sz(x)               x.size()
#define all(x)              x.begin(),x.end()
#define CIN                 ios_base::sync_with_stdio(0); cin.tie(0)
#define max3(a, b, c)       max(a, b) > max(b, c) ? max(a, b) : max(b, c)
#define min3(a, b, c)       min(a, b) < min(b, c) ? min(a, b) : min(b, c)
#define for0(i,n)           for(int i=0;i<n;i++)
#define for1(i,n)           for(int i=1;i<=n;i++)
#define forrev(i,n)         for(int i=n-1; i>=0; i--)
#define forab(i,a,b)        for(int i=a;i<=b;i++)
#define forba(i,b,a)        for(int i=b;i>=a;i--)
#define stlloop(x)          for(__typeof(x.begin()) it=x.begin();it!=x.end();it++)
#define gcd(a, b)           __gcd(a, b)
#define lcm(a, b)           ((a)*((b)/gcd(a,b)))
#define case1(z)            cout<<"Case "<<z<<": "
#define case2(z)            printf("Case %d: ",z)
#define PI                  acos(-1) //3.14159265358979323846264338328
#define valid(tx,ty)        tx>=0 && tx<row && ty>=0 && ty<col
#define intlim              2147483648
#define N                   200005
#define inf                 100000008
#define mod                 1000000007

/*------------------------------Graph Moves----------------------------*/
//const int fx[]={+1,-1,+0,+0};
//const int fy[]={+0,+0,+1,-1};
//const int fx[]={+0,+0,+1,-1,-1,+1,-1,+1};   // Kings Move
//const int fy[]={-1,+1,+0,+0,+1,+1,-1,-1};  // Kings Move
//const int fx[]={-2, -2, -1, -1,  1,  1,  2,  2};  // Knights Move
//const int fy[]={-1,  1, -2,  2, -2,  2, -1,  1}; // Knights Move
/*---------------------------------------------------------------------*/

ll c[3005][3005];
char b[3005][3005];



void print_lcs(string s,ll i,ll j)
{
    if(i==0 || j==0)
        return;
    else if(b[i][j]!='<' && b[i][j]!='^')
    {
        print_lcs(s,i-1,j-1);
        cout<<b[i][j];
    }
    else if(b[i][j]=='^') print_lcs(s,i-1,j);
    else if(b[i][j]=='<') print_lcs(s,i,j-1);

}


int main()
{
    ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    char s[3005],t[3005];
    string p,q;
    cin>>p>>q;
    ll i,j,ls,lt;
    ls=p.length();
    lt=q.length();
    for(i=0;i<ls;i++)
        s[i+1]=p[i];
    for(i=0;i<lt;i++)
        t[i+1]=q[i];
    for(i=0;i<=ls;i++) c[0][i]=0;

    for(i=0;i<=lt;i++) c[i][0]=0;

    for(i=1;i<=lt;i++)
    {
        for(j=1;j<=ls;j++)
        {
            if(t[i]==s[j])
            {
                c[i][j]=c[i-1][j-1]+1;
                b[i][j]=s[j];
            }
            else if(c[i-1][j]>=c[i][j-1])
            {
                c[i][j]=c[i-1][j];
                b[i][j]='^';
            }
            else
            {
                c[i][j]=c[i][j-1];
                b[i][j]='<';
            }
        }
    }
    /*for(i=1;i<=lt;i++)
    {
        for(j=1;j<=ls;j++)
            cout<<b[i][j]<<" ";
        cout<<endl;
    }*/
    print_lcs(s,lt,ls);
    cout<<endl;
	return 0;
}





























Measured memory_bytes: 79744