Memory training
Problem
Deniska decided to train Mishka's memory. To do this, he decided to name some numbers. And Mishka for each number must say the word
YES, if this number was previously called Deniska or
NO, if it was not called. Help Deniska train Mishka, write a program that would show what answer Mishka should pronounce.
Input
Enter a list of numbers. All numbers in the list are on the same line.
Imprint
For each number, print the word
YES (in a separate line) if this number has previously occurred in the sequence or
NO if it has not.
Examples
| # |
Input |
Output |
| 1 |
1 2 3 2 3 4 |
NO
NO
NO
YES
YES
NO |