2441번 '별 찍기 - 4'

let input = Int(readLine()!)!
for i in 1...input{
    let columnBlank = i - 1
    var string = ""
    for _ in 0..<columnBlank{
        string.append(" ")
    }
    for _ in columnBlank+1 ... input{
        string.append("*")
    }
    print(string)
}