def main():
    n, k = map(int, input().split())
    s = list(input())
    ans = ''.join(solve(n, k, s))
    print(ans)

def solve(n, k, s):
    if n == k:
        return s[::-1]
    return s[k - 1:] + s[:k -1]

if __name__ == '__main__':
    main()