MOD = 10 ** 9 + 7
INF = 10 ** 10
import sys
sys.setrecursionlimit(100000000)
dy = (-1,0,1,0)
dx = (0,1,0,-1)

def main():
    n,k = map(int,input().split())
    s = input()
    t = s[:k - 1]
    if (n - k + 1)%2 == 0:
        ans = s[k - 1:] + t
    else:
        ans = s[k - 1:] + t[::-1]
    print(ans)
if __name__ =='__main__':
    main()