#include <iostream>
 #include <string>

 using namespace std;

 ;

 string sum(string s1,string s2)
 {
     if(s1.length()<s2.length())
     {
         string temp=s1;
         s1=s2;
         s2=temp;
     }
     int i,j;
     ,j=s2.length()-;i>=;i--,j--)
     {
         s1[i]=?s2[j]-));   //注意细节
         )
         {
             s1[i]=+');
             ]++;
             '+s1;
         }
     }
     return s1;
 }

 int main()
 {
     //freopen("D://input.txt","r",stdin);

     int i;

     string str0,str1,str2,str3;

     while(cin >> str0 >> str1 >> str2)
     {
         //cout << str0 << endl;
         //cout << str1 << endl;
         //cout << str2 << endl;

         i = Num - ;
         while(i--)
         {
             str3 = sum(str0,str1);
             str3 = sum(str3,str2);
             str0 = str1;
             str1 = str2;
             str2 = str3;
         }

         cout << str3 << endl;

     }

     ;
 }