Score : $200$ points
We call a string hard-to-read when its odd-positioned ($1$-st, $3$-rd, $5$-th, ... from the beginning) characters are all lowercase English letters and its even-positioned characters ($2$-nd, $4$-th, $6$-th, ... from the beginning) are all uppercase English letters.
Determine whether a string $S$ is hard-to-read.
Input is given from Standard Input in the following format:
$S$
If $S$ is hard-to-read, print Yes
; otherwise, print No
.
dIfFiCuLt
Yes
The odd-positioned characters are all lowercase and the even-positioned characters are all uppercase, so it is hard-to-read.
eASY
No
The $3$-rd character is not lowercase, so it is not hard-to-read.
a
Yes