#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a[1001]={},b[1001]={}; int n=0,z=0,x=0,y=0; cin>>a; cin>>b; x=strlen(a); y=strlen(b); for(int i=0;i<x;i++){ if('0'<=a[i]&&a[i]<='9')n++; } for(int j=0;j<y;j++){ if('0'<=b[j]&&b[j]<='9')z++; } if(n>z){ for(int i=y-1;i>=0;i--)cout<<b[i]; cout<<a[n-1]<<endl; } else{ for(int i=x-1;i>=0;i--)cout<<a[i]; cout<<b[z-1]<<endl; } return 0; }