#include<stdio.h>
#include<string.h>
int main() {

	char number[7];
	char c1, c2;
	strcpy(number, "123");
	c1 = '1';
	c2 = '3';

	while (strcmp(number,"0") != 0 || c1 != '0' || c2 != '0') {
		scanf("%s %c %c", &number, &c1, &c2);

		for (int i = 0; i < strlen(number); i++) {
			if (number[i] == c1) {
				printf("%c", c2);
			}
			else {
				printf("%c",number[i]);
			}
		}
		printf("\n");
	}
}