Problem Description

JOI High School has $ N $ students, each assigned a unique attendance number from $ 1 $ to $ N $.

Next month, JOI High School will host a sports day, and all $ N $ students will participate. Among the students, $ K $ are in the Red Team, and the remaining $ N-K $ are in the White Team.

Azalea, who has the attendance number $ N $, has forgotten which team she belongs to. Therefore, she decided to ask the other $ N-1 $ students about their team assignments to determine which team she belongs to.

The team assignment information for the $ N-1 $ students other than Azalea is represented by a string $ S $ of length $ N-1 $. Each character in $ S $ is either R or W, with the following meanings:

• If the $ i $-th character of $ S $ ($1 \leq i \leq N-1$) is R, it indicates that the student with attendance number $ i $ is in the Red Team.
• If the $ i $-th character of $ S $ ($1 \leq i \leq N-1$) is W, it indicates that the student with attendance number $ i $ is in the White Team.

Output R if Azalea is in the Red Team, or W if she is in the White Team.

Input Format

The input is given from the standard input in the following format:

$ N $ $ K $ $ S $

Output Format

Output R if Azalea is in the Red Team, or W if she is in the White Team.

Sample Input and Output

Sample Input #1

7
3
RWWRWW

Sample Output #1

R

Sample Input #2

5
3
RWRR

Sample Output #2

W

Sample Input #3

70
1
WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW

Sample Output #3

R

Notes/Hints

Constraints

• $2 \leq N \leq 2,000$.
• $1 \leq K \leq N-1$.
• $ S $ is a string of length $ N-1 $.
• Each character in $ S $ is either R or W.
• The number of R characters in $ S $ is either $ K-1 $ or $ K $.
• $ N $ and $ K $ are integers.

Sample Explanation 1

The students with attendance numbers $ 1, 2, 3, 4, 5, 6 $ are in the Red Team, White Team, White Team, Red Team, White Team, and White Team, respectively. Excluding Azalea, there are $ 2 $ students in the Red Team and $ 4 $ students in the White Team. Since $ 3 $ students are in the Red Team and the remaining $ 4 $ are in the White Team, Azalea is in the Red Team. Therefore, output R.

Sample Explanation 2

The students with attendance numbers $ 1, 2, 3, 4 $ are in the Red Team, White Team, Red Team, and Red Team, respectively. Excluding Azalea, there are $ 3 $ students in the Red Team and $ 1 $ student in the White Team. Since $ 3 $ students are in the Red Team and the remaining $ 2 $ are in the White Team, Azalea is in the White Team. Therefore, output W.

见题面 Input 部分

见题面 Output 部分