Score : $200$ points

问题描述

Takahashi 买了一个台式钟表。
该钟表以如图1所示的方式显示时间，格式为$\mathrm{AB}$:$\mathrm{CD}$，采用24小时制。例如，图2中的钟表显示的时间为7:58。

时间格式正式描述如下：

假设当前时间为24小时制下的$h$时$m$分。在24小时制中，小时用0到23（含）之间的整数表示，分钟用0到59（含）之间的整数表示。

设 $A$ 为$h$的十位数字，$B$ 为$h$的个位数字，$C$ 为$m$的十位数字，$D$ 为$m$的个位数字。（此处，若$h$只有一个数字，则视为其前面有一个零；$m$同理。）

则钟表上显示的数字为：左上角为$A$，左下角为$B$，右上角为$C$，右下角为$D$。

Takahashi 将满足以下条件的时间定义为混淆时间：

• 将钟表上的右上角和左下角的数字交换后，仍能读出一个有效的24小时制时间。

例如，图3中的钟表显示的时间为20:13。将其右上角和左下角的数字交换后，显示为21:03。因此，20:13是一个混淆时间。

现在钟表显示的时间为$H$:$M$。
请找出下一个（包括当前时间）混淆时间，并以24小时制表示。

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

Takahashi bought a table clock.
The clock shows the time as shown in Figure 1 at $\mathrm{AB}$:$\mathrm{CD}$ in the $24$-hour system.
For example, the clock in Figure 2 shows 7:58.

The format of the time is formally described as follows.
Suppose that the current time is $m$ minutes past $h$ in the $24$-hour system. Here, the $24$-hour system represents the hour by an integer between $0$ and $23$ (inclusive), and the minute by an integer between $0$ and $59$ (inclusive).
Let $A$ be the tens digit of $h$, $B$ be the ones digit of $h$, $C$ be the tens digit of $m$, and $D$ be the ones digit of $m$. (Here, if $h$ has only one digit, we consider that it has a leading zero; the same applies to $m$.)
Then, the clock shows $A$ in its top-left, $B$ in its bottom-left, $C$ in its top-right, and $D$ in its bottom-right.

Takahashi has decided to call a time a confusing time if it satisfies the following condition:

• after swapping the top-right and bottom-left digits on the clock, it still reads a valid time in the $24$-hour system.

For example, the clock in Figure 3 shows 20:13. After swapping its top-right and bottom-left digits, it reads 21:03. Thus, 20:13 is a confusing time.

The clock now shows $H$:$M$.
Find the next confusing time (including now) in the $24$-hour system.

Constraints

• $0 \leq H \leq 23$
• $0 \leq M \leq 59$
• $H$ and $M$ are integers.

Input

The input is given from Standard Input in the following format:

$H$ $M$

Output

Let $h$:$m$ be the answer, where $h$ and $m$ must satisfy $0 \leq h \leq 23$ and $0 \leq m \leq 59$.

Print $h$ and $m$ in the following format:

$h$ $m$

Your answer is considered correct even if $h$ contains a leading zero to represent it as a $2$-digit integer; the same applies to $m$.

Sample Input 1

1 23

Sample Output 1

1 23

1:23 is a confusing time because, after swapping its top-right and bottom-left digits on the clock, it reads 2:13.
Thus, the answer is 1:23.
Your answer is considered correct even if you print 01 23 with a leading zero.

Sample Input 2

19 57

Sample Output 2

20 0

The next confusing time after 19:57 is 20:00.

Sample Input 3

20 40

Sample Output 3

21 0

Note that 24:00 is an invalid notation in the $24$-hour system.

update @ 2024/3/10 11:41:53