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

if (n-k+1) % 2 == 0:
    for i in range(n):
        print(s[(k+i-1)%n],end='')
else:
    for i in range(n):
        if i <= n-k:
            print(s[(k+i-1)%n],end='')
        else:
            print(s[n-i-1],end='')