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import Foundation let input : String = readLine()!; var idx : Int = 0 while idx + 10 < input.characters.count { var startIdx = input.index(input.startIndex, offsetBy: idx) var endIdx = input.index(input.startIndex, offsetBy: idx + 10) let range = startIdx ..< endIdx print(input.substring(with: range)) idx += 10} var startIdx = input.index(input.startIndex, offsetBy: idx)var endIdx = input.endInd..

import Foundation let n : Int = Int(readLine()!)!var sum : Int = 0 for index in 1...n { sum += index} print(sum)

import Foundation let input : String = readLine()!;let inputArr = input.characters.split(separator: " ").map({Int(String($0))!}) var sum = 0 for number in inputArr { sum += number} print(sum)