题解 | 图片整理

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
public class Program {
    public static void Main() {
        char[] C = Console.ReadLine().ToCharArray();

        for (int i = 0; i < C.Length; i++) {
            for (int j = i + 1; j < C.Length; j++) {
                if (Convert.ToInt32(C[i]) > Convert.ToInt32(C[j])) {
                    char T = C[i];
                    C[i] = C[j];
                    C[j] = T;
                }
            }
        }
        string A = C[0].ToString();
        for (int i = 1; i < C.Length; i++) {
            A = A + C[i].ToString();
        }

        Console.WriteLine(A);
    }
}