
func aaa(sample:String) {
    let a = String(readLine()!)
    var b = [String]()
    for num in a{
        b.append(String(num))
    }

    let iValue = Int.random(in: 0 ... (a.count - 2))
    
    
    var answer = b[iValue] + b[iValue + 1] + b[iValue + 2]
    print(answer)
}


main()
