#include<cstdio>
#include<cstring>
using namespace std;
int c1,c2,z,y,nr,c,i,k,n;
char s1[100],s[1000];
int main()
{
    //freopen("input","r",stdin);
    //freopen("output","w",stdout);
    while(1)
    {
        gets(s);
        n=strlen(s)-1;
        z=1;
        nr=0;
        i=0;
        while(s[i]!=' ')
        {
            s1[i]=s[i];
            i++;
        }
        s1[i]=0;
        k=i-1;
        for(i=i+1;i<=n;i++)
        {
            c=s[i]-48;
            if(c>=0&&c<=9)nr=nr*10+c;
            else if(s[i]==' '){c1=nr;nr=0;}
        }
        c2=nr;
        if(c1==0&&c2==0&&s1[0]==48&&s1[1]==0)break;
        for(i=0;i<=k;i++)
        {
            c=s1[i]-48;
            if(c==c1)s1[i]=c2+48;
        }
        z=0;
        for(i=0;i<=k;i++)
        {
            c=s1[i]-48;
            if(c!=0){z=1;printf("%d",c);}
            else if(c==0&&z==1)printf("0");
        }
        printf("\n");
    }
    return 0;
}