#include<iostream>
using namespace std;
int main(){
    string a,b;
    while(cin>>a>>b){
        int p=0;
        for(int i=0;a[i];i++)if(a[i]>a[p])p=i;
        cout<<a.substr(0,p+1)+b+a.substr(p+1)<<endl;
    }

}