#include <iostream>

using namespace std;

int main(){
    int c1,c2,i,x;
    int a[100000];
    do{
    cin>>x;
    for (i=1;i<=x;i++)
        cin>>a[i];
    cin>>c1;
    cin>>c2;
    for (i=1;i<=x;i++)
        if(a[i]==c1)
        a[i]=c2;
    for (i=1;i<=x;i++)
        cout<<a[i];}while((a[1]!=0)&&(c1!=0)&&(c2!=0));

}