n,k=gets.split.map(&:to_i)
s=gets.chomp
(0..(n-k)).each do |index|
    firstWord = index == 0 ?  "" : s[0...index]
    reverseWord = s[index...(k+index)].reverse
    endWord = (k+index) == n ?  "" : s[(k+index)...n]
    s = firstWord + reverseWord + endWord
end
puts s