Flipping Digit Example

Q. You are given a number A which contains only digits 0's and 1's. Your task is to make all digits same by just flipping one digit (i.e. 0 to 1 or 1 to 0) only. If it is possible to make all digits same by just flipping one digit then print 'YES' else print 'NO'.

Input Format:

The first line contains a number made up of 0's and 1's.

Output Format:

Print 'YES' or 'NO' accordingly without quotes.

Example:

Input:
101
Output:
YES

Explanation:
If you flip the middle digit from 0 to 1 then all the digits will become same. Hence output is YES.

Solution:


Outputs:

Enter a binary number: 1101
YES

Enter a binary number: 1001
NO

.