variable "a" {}
variable "b" {
  default = "test"
}
variable "c" {
  type = list
  default = ["foo", "bar", "baz"]
}

output "ov1" {
  value = "${var.a}"
}
output "ov2" {
  value = "${var.b}"
}
output "ov3" {
  value = "${var.c[2]}"
}