import sys
from math import log


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n, k = map(int, input().split())
    a = list(input())
    if n % 2 == k % 2:
        a[:k] = reversed(a[:k])

    print(''.join(a[(k - 1):]+a[:(k - 1)]))


if __name__ == '__main__':
    main()