from collections import deque 
import sys
n, k = map(int, sys.stdin.readline().split(" "))
num = deque( sys.stdin.readline())
num.pop()
cnt = 0
sw = 0
while True:
    s = num.popleft()
    isSort = True
    for i in range(len(num)):
        tmp = num.popleft()
        if s[-1] < tmp:
            cnt += 1
            isSort = False
            s = s[:-1]+tmp
        else:
            s += tmp
        if cnt == k:
            for j in range(len(s)-1, -1, -1):
                num.appendleft(s[j])
            sw = 1
            break
    if sw:
        break
    if isSort:
        num = deque(s)
        for i in range(k-cnt):
            num.pop()
        break
    num = deque(s)
 
for i in range(len(num)):
    print(num.popleft(), end="")

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

NyAzCjEyMzEyMzQ=

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