from ctypes import *
import sys
#file = open(sys.argv[1])
#fileContents = file.read()
fileContents = sys.stdin.readlines()
#for line in fileContents.splitlines():
for line in fileContents:
    splitLine = line.split()
    position = int(splitLine[0])
    test = splitLine[1]
    stringAsList = list(test)
    listOfLists = list()
    def mapTest(list1,string):
        list1.insert(0,string)
    i = 0
    originalList = list()
    for s in stringAsList:
        newList = list(s)
        if i == position:
            originalList = newList
        listOfLists.append(newList)
        i = i+1
    listOfLists.sort();
    for i in range(0,len(test)-1):
        map(mapTest,listOfLists,stringAsList)
        listOfLists.sort();
    print ''.join(originalList)