Problem Statement

Takahashi eats three plates for breakfast: rice, miso soup, and salad.
His table is long and narrow, so he arranged the three plates in a row. The arrangement is given by a string S, where the i-th plate from the left is rice if S_i is R, miso soup if S_i is M, and salad if S_i is S.
Determine whether the plate of rice is to the left of the plate of miso soup.

Input

The input is given from Standard Input in the following format:
S

Output

Print Yes if the plate of rice is to the left of the plate of miso soup, and No otherwise.

Constraints

• |S| = 3
• S contains one R, one M, and one S.

Sample Input 1

RSM

Sample Output 1

Yes

The plate of rice is at the 1st position from the left, and the plate of miso soup is at the 3rd position from the left. Since the plate of rice is to the left, print Yes.

Sample Input 2

SMR

Sample Output 2

No

The plates are arranged as salad, miso soup, and rice from left to right.

见题面 Input 部分

见题面 Output 部分