fun main(args: Array<String>) {
    val list = listOf(1, 1, 1, 2, 3, 3, 6, 6, 6, 6, 6, 8)
    val res = mutableListOf<Int>()
    
    for(i in 0..list.lastIndex - 1) {
        res += list[i]
        
        if(list[i] != list[i + 1])
        	res += 0
    }
  	res += list.last()  
  
    println(res)
}