#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(){ int m,s1=0,s2=0,x,y,i; char a[1001]={0},b[1001]={0}; cin>>a>>b; x=strlen(a); y=strlen(b); for(i=0;i<x;i++){ if(a[i]>='0'&&a[i]<='9') s1++; } for(i=0;i<y;i++){ if(b[i]>='0'&&b[i]<='9') s2++; } if(s1>s2){ for(i=y-1;i>=0;i--) cout<<b[i]; cout<<a[s1-1]; } else if(s1<s2){ for(i=x-1;i>=0;i--) cout<<a[i]; cout<<b[s2-1]; } return 0; }