import sys

n, k = map(int, sys.stdin.readline().split())
s = sys.stdin.readline().rstrip()

def main():
    l = s[k-1:]
    r = s[:k-1]
    if (n - k + 1) & 1:
        r = r[::-1]
    print(l + r)
if __name__ == '__main__':
    main()