#include<bits/stdc++.h> using namespace std; int main(){ string a,b; cin>>a>>b; int sum=0,sum1=0; for(int i=0;i<a.size();i++)if(a[i]<='9'&&a[i]>='0') sum++; for(int i=0;i<b.size();i++)if(b[i]<='9'&&b[i]>='0') sum1++; if(sum1>sum){ reverse(a.begin(),a.end()); cout<<a<<b[sum1-1]<<endl; } else{ reverse(b.begin(),b.end()); cout<<b<<a[sum-1]<<endl; } return 0; }