print the min lexographic order of main string which contains the pattern string (qk18)

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<string,int> psi;
typedef map<int,int> mii;
typedef map<long long,long long> mll;
typedef map<string,int> msi;
typedef map<char,int> mci;
typedef set<int> si;
typedef set<long long> sll;
typedef set<string> ss;
typedef set<char> sc;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<char> vc;
typedef vector<ll> vll;
typedef vector<vector<int>> vvi;
typedef vector<vector<string>> vvs;
typedef vector<vector<ll>> vvll;

#define FOR(i, a, b) for (auto i=a; i<=(b); i++)
#define FORd(i,b,a) for (int i =b; i >= a; i--)
#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define ins insert

const int MOD = 1000000007;
//type functions here



int main() {

    int tc=1;
    //cin>>tc;
    FOR(w,1,tc)
    {
        mci m1,m2;
        string s1="a",s2="a";
        //cin>>s1>>s2;
        for(auto x:s1) m1[x]++;
        for(auto x:s2) m2[x]++;
        for(auto x:m2) m1[x.f]-=x.s;//deleting the pattern chars from the big string

        string s="";
        int flag=0;
        for(auto x:m1)
        {
              while(x.s)
            {
                s+=x.f;
                x.s--;
            }
            if(x.f>=s2[0]&&flag==0)
            {s+=s2;
            flag=1;
            }



        }
        cout<<s<<endl;

    }
    return 0;
}