#include <iostream>
#include <fstream>
using namespace std;


int main()
{
   // freopen("input.in","r", stdin);

    while ( !feof(stdin) )
    {
        string  s1 , s2 , s3 ;
        cin >> s1 >> s2 >> s3;
        if( s1 == "0" && s2 == "0" && s3 == "0" ) putchar('\n') ;
        else
        {
            for (int i = 0 ; i < int(s1.size() )  ; i ++ )
            {
                if( i == 0 && s2[0] == s1[0] && s3[0] == '0' ) cout << "";
                else if ( s1[i]!= s2[0] ) cout << s1[i] ;

                else cout << s3  ;
            }
            cout << '\n' ;

        }

    }

    return 0;
}