#include<bits/stdc++.h>

using namespace std;

int main()
{
    int t,min_len = 10000,ansl = 0,ansr = 0;
    string s,p;
    cin>>s>>p;
    for(int i = 0; i<=s.size()-p.size(); i++)
    {
        if(s[i] == p[0])
        {
            t = 1;
            for(int j = i+1; j<s.size(); j++)
            {
                if(j - i == min_len) break;
                if(s[j] == p[t]) t++;

                if(t == p.size() && j-i <= min_len)
                {
                    ansl = i,ansr = j;
                    min_len = j-i;
                    break;
                }
            }
        }
    }
    for(int i = ansl; i<=ansr; i++) cout<<s[i];
    return 0;
}