# coding: utf-8
# Your code here!
import sys
sys.setrecursionlimit(10**6)
readline = sys.stdin.readline
read = sys.stdin.read

from collections import deque

n,k = [int(i) for i in readline().split()]
s = input()


v = s[:k-1]
if k%2==0: v = v[::-1]
ans = s[k-1:]+v

print(ans)