#include<iostream>
#include<cstring>
using namespace std;

int main()
{
	int  i;
	char nr[100001],c1,c2;
	do
	{
		cin >> nr >> c1 >> c2;
		if (nr[0] == '0' && c1 == '0' && c2 == '0')
			break;
		for (i = 0; i < strlen(nr);i++)
		if (nr[i] == c1) nr[i] = c2;
		i = 0;
		while (nr[i] == '0') i++;
		if (nr[i] == '\0') cout << 0 << "\n";
		else		cout << nr+i << "\n";
	} while (1 == 1);
}