Write a program that determines if a given number contains two identical digits side by side (such as 221).
Input
The program receives as input one natural number N (N > 9).
Imprint
The program should output the word 'YES' if the number has two identical digits side by side, and the word 'NO' , if there is no such pair of digits.
Examples
| # |
Input |
Output |
| 1 |
1221 |
YES |
| 2 |
123 |
NO |
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