#include<bits/stdc++.h> using namespace std; int main(){ string a,b; int sum=0,mus=0; cin>>a>>b; for(int i=0;i<a.length();i++)if(a[i]>='0'&&a[i]<='9')sum++; for(int i=0;i<b.length();i++)if(b[i]>='0'&&b[i]<='9')mus++; if(sum>=mus){ reverse(b.begin(),b.end()); cout<<b<<a[sum-1]<<endl; } else{ reverse(a.begin(),a.end()); cout<<a<<b[mus-1]<<endl; } return 0; }