#include <iostream>

using namespace std;

char n[10],c1,c2;
int main(){
    while(1){
        cin>>n>>c1>>c2;
        if(n[0]=='0' && c1=='0' && c2=='0')
            break;
        for(int i=0;n[i]!=0;i++)
            if(n[i]==c1)
                n[i]=c2;
        if(n[0]!='0')
            cout<<n<<"\n";
        else
            cout<<n+1<<"\n";
    }
    return 0;
}