#include <iostream>
#include<string.h>
using namespace std;

int main()
{
    int n,s1=0,s2=0,i;
    char a[111],b,c;
    cin>>a>>b>>c;
    /*n=strlen(a);
    for(i=0;i<n;i++)
    {
        if (a[i]==b)
            a[i]=c;
    }
    cout<<a;*/
    while(strcmp(a,"0")!=NULL||b!='0'||c!='0')
    {
        n=strlen(a);
        for(i=0;i<n;i++)
        if (a[i]==b)
            a[i]=c;
        while(a[0]=='0')
            strcpy(a,a+1);
        cout<<a<<'\n';
        cin>>a>>b>>c;
    }
    return 0;
}