#include <stdio.h> int isOddDigits(int num) { while (num > 0) { int digit = num % 10; if (digit % 2 == 0) { return 0; } num /= 10; } return 1; } int main() { int N, M, count = 0; scanf("%d %d", &N, &M); for (int i = N; i <= M; i++) { if (isOddDigits(i)) { count++; } } printf("%d\n", count); return 0; }