#include <stdio.h>

int main()
{
    char s[10];
    char c1;
    char c2;
    int stop = 0;
    while(stop == 0)
    {
        scanf("%s %c %c", s, &c1, &c2);
        if(s[0] == '0')
        {
            stop = 1;
        }
        else
        {
            for(int i = 0; i < sizeof(s); i++)
            {
                if(s[i] == c1)
                    s[i] = c2;
            }

            printf("%s\n", s);
        }
    }
    return 0;
}