In this problem you must write a program in C to determine whether or not a sequence of values $$is in ascending order. You should in no way use a vector to solve this problem. If a vector is used, your grade will be zero.

$2$ Input

The input will consist of a number n$,$ which indicates how many values $$constitute the sequence to be checked. The sequence will be

given below, with numbers separated by space $($read the input with scanf normally$).$

$3$ Output

For each entry, you must print YES if it is in ascending order and NO otherwise.

$4$ Input Example

$4$

$1379$

$5$ Example Output

YES