Valid Clock Time
Is S a valid 24-hour clock time in exactly the form HH:MM (two digits, colon, two digits)?
Input: one line with the candidate string S.
Output: YES or NO.
Constraints:
- 1 ≤ |S| ≤ 100
Sample Tests
Input 1
23:59
Output 1
YES
Input 2
24:00
Output 2
NO
Discussion (opens after you solve — no spoilers before)
No comments yet.