#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],s[1001]; cin>>a>>s; int a1=strlen(a),s1=strlen(s),a2=0,s2=0; for(int i=0;i<a1;i++){ if(a[i]>='0'&&'9'>=a[i]) a2++; } for(int i=0;i<s1;i++){ if(s[i]>='0'&&'9'>=s[i]) s2++; } if(a2>s2){ for(int i=s1-1;i>=0;i--) cout<<s[i]; cout<<a[a2-1]; } else if (a2<s2){ for(int i=a1-1;i>=0;i--) cout<<a[i]; cout<<s[s2-1]; } return 0; }