Bulls and Cows
Score a Bulls-and-Cows guess: a bull is a correct digit in the correct position; a cow is a correct digit in the wrong position (each digit instance counts once). Print xAyB for x bulls, y cows.
Input: two lines of equal length: the secret, then the guess (digits).
Output: the score in the form xAyB.
Constraints:
- 1 ≤ length ≤ 12
Sample Tests
Input 1
1807 7810
Output 1
1A3B
Input 2
1123 0111
Output 2
1A1B
Discussion (opens after you solve — no spoilers before)
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