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#include <stdio.h> int isLucky(int num) { while (num > 0) { int digit = num % 10; if (digit != 4 && digit != 7) { return 0; // Not a lucky number } num /= 10; } return 1; // It's a lucky number } int main() { int A, B; scanf("%d %d", &A, &B); int found = 0; for (int i = A; i <= B; i++) { if (isLucky(i)) { printf("%d ", i); found = 1; } } if (!found) { printf("-1"); } return 0; }