CF770B.Maximize Sum of Digits

普及/提高-

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题目描述

Anton has the integer xx . He is interested what positive integer, which doesn't exceed xx , has the maximum sum of digits.

Your task is to help Anton and to find the integer that interests him. If there are several such integers, determine the biggest of them.

输入格式

The first line contains the positive integer xx ( 1<=x<=10181<=x<=10^{18} ) — the integer which Anton has.

输出格式

Print the positive integer which doesn't exceed xx and has the maximum sum of digits. If there are several such integers, print the biggest of them. Printed integer must not contain leading zeros.

输入输出样例

  • 输入#1

    100
    

    输出#1

    99
    
  • 输入#2

    48
    

    输出#2

    48
    
  • 输入#3

    521
    

    输出#3

    499
    
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