[백준] 1110번 더하기 사이클

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);
        int num = kb.nextInt();
        int originalNum = num; 
        int count = 0;
        
        do {
            int tensDigit = num / 10; 
            int onesDigit = num % 10; 
            int sum = tensDigit + onesDigit; 
            num = (onesDigit * 10) + (sum % 10);
            count++;
        } while (num != originalNum); 
        
        System.out.print(count);
    }
}