#include<iostream>
#include<cstring>
using namespace std;
int main(){
char n[7],a,b;
register short i;
cin>>n>>a>>b;
do{
	i=strlen(n);
	while(i--)
		if(n[i]==a)
			n[i]=b;
	i=0;
	while(n[i]=='0')
		i++;
	if(n[i]==0)		cout<<"0\n";
	else			cout<<n+i<<"\n";
	cin>>n>>a>>b;
}while(n[0]!='0' || a!='0' || b!='0');

return 0;
}