#include<iostream>
#include<algorithm>
#include<string>
#include<cstring>
using namespace std;

int i;
char c,c1;
string s;

int main()
{
  while(1)
  {
    cin>>s>>c>>c1;
    if(s=="0" && c=='0' && c1=='0') return 0;

    for(i=0;i<s.length();++i)
    if(s[i]==c) s[i]=c1;

    i=0;
    while(s[i]=='0' && i<s.length()) ++i;
    if(i==s.length()) cout<<"0\n";
    else { for(;i<s.length();++i) cout<<s[i]; cout<<'\n'; }
  }
    
    
 return 0;
}