Different digits

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문제 설명

예제1

문제

Senya likes integers not containing two consecutive equal digits. You are given an integer $n$ . Help Senya to find the smallest integer he likes, which is strictly greater than $n$ .

입력

Input contains integer $n$ ( $1 \le n \le 10^{18}$ ).

출력

Print the smallest integer strictly greater than $n$ , which doesn't contain any two consecutive equal digits.