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())
    print(''.join(a[(k - 1):] + (a[:(k - 1)] if n % 2 != k % 2 else list(reversed(a[:(k - 1)])))))


if __name__ == '__main__':
    main()