It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.

Input

The single line contains integer y (1000?≤?y?≤?9000) — the year number.

Output

Print a single integer — the minimum year number that is strictly larger than y and all it's digits are distinct. It is guaranteed that the answer exists.

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2013年仿佛就在昨天。 你知道一個(gè)奇怪的事實(shí)嗎？ 2013 年是 1987 年之后的第一年，只有不同的數(shù)字。

現(xiàn)在建議您解決以下問題：給定一個(gè)年份數(shù)字，找到嚴(yán)格大于給定年份且只有不同數(shù)字的最小年份數(shù)字。

輸入

單行包含整數(shù) y (1000?≤?y?≤?9000) — 年份數(shù)。

輸出

打印一個(gè)整數(shù)——嚴(yán)格大于 y 的最小年份數(shù)，并且它的所有數(shù)字都是不同的。 保證答案存在。

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while循環(huán)+函數(shù)判斷即可；

下面是代碼：