#!/usr/bin/env python3
import sys
input = sys.stdin.readline

n, k = map(int, input().split())
s = list(input().rstrip())

if (n - k + 1) % 2 == 1:
    t = s[:k-1]
    t.reverse()
    s =  s[k-1:] + t
else:
    s =  s[k-1:] + s[:k-1]
print("".join([item for item in s]))