MIN provided a relevant answer that was outside the very limited scope of the OP's question. She provided a better solution. If the OP takes this on board he will probably save himself some hassle and a bit of cash as money changer rates tend to be quite bad.
If anyone is going to Myanmar, Mandalay or Yangoon, then I am sure that they will appreciate your input.
Last time I used a money changer was in Sri Lanka, but that was only because we had a load of USD that we wanted to get rid of. Otherwise it was just as convenient and slightly cheaper to use ATMs.