fun test1(a: String, b: Any): String {
  return a.plus(other = b)
}

fun test2(a: String, b: Int): String {
  return a.plus(other = "+").plus(other = b)
}

fun test3(a: String, b: Int): String {
  return a.plus(other = "+").plus(other = b.plus(other = 1)).plus(other = a)
}
