Prankster(560)

Ivica got a string for Easter. Sadly, his little brother played with the string a bit. In each move, he took 2 letters of the string and swapped them. Ivica's string is unstable and a letter falls out of the string if it's swapped 2 times. Ivica can predict what moves will his little brother make so he asks you to tell him what will the string look like after the modifications!