local n, k = io.read("*n", "*n", "*l")
local s = io.read()
io.write(s:sub(k, n))
if (n - k) % 2 == 1 then
  io.write(s:sub(1, k - 1))
else
  io.write(s:sub(1, k - 1):reverse())
end
io.write("\n")