백준 - 숫자의 개수 (2577)

let A = Int(readLine()!)!
let B = Int(readLine()!)!
let C = Int(readLine()!)!
let result = String(A * B * C)

var numbers = Array(repeating: 0, count: 10)

result.forEach { numbers[Int(String($0))!] += 1 }
numbers.forEach { print($0) }