#include<iostream> #include<algorithm> using namespace std; int main(){ string a,b; int s=0,ss=0; cin>>a>>b; for(int i=0;i<a.size();i++){ if(a[i]>='0' && a[i]<='9'){ s++; } }for(int i=0;i<b.size();i++){ if(b[i]>='0' && b[i]<='9'){ ss++; } }if(s>ss){ reverse(b.begin(),b.end()); cout<<b<<a[s-1]; }else{ reverse(a.begin(),a.end()); cout<<a<<b[ss-1]; } return 0; }