#include <iostream>
using namespace std;

int main()
{
    char c1, c2;
    char n[5];

    while(true)
    {
        cin>>n>>c1>>c2;
        if(n[0]=='0')return 0;
        for(int i=0;n[i]!='\0';i++)if(n[i]==c1)n[i]=c2;
        cout<<n<<'\n';
    }
}