Score: 200 points
Takahashi will do a tap dance. The dance is described by a string S where each character is L
, R
, U
, or D
. These characters indicate the positions on which Takahashi should step. He will follow these instructions one by one in order, starting with the first character.
S is said to be easily playable if and only if it satisfies both of the following conditions:
R
, U
, or D
.L
, U
, or D
.Your task is to print Yes
if S is easily playable, and No
otherwise.
L
, R
, U
, or D
.Input is given from Standard Input in the following format:
S
Print Yes
if S is easily playable, and No
otherwise.
RUDLUDR
Yes
Every character in an odd position (1-st, 3-rd, 5-th, 7-th) is R
, U
, or D
.
Every character in an even position (2-nd, 4-th, 6-th) is L
, U
, or D
.
Thus, S is easily playable.
DULL
No
The 3-rd character is not R
, U
, nor D
, so S is not easily playable.
UUUUUUUUUUUUUUU
Yes
ULURU
No
RDULULDURURLRDULRLR
Yes