谁看看我程序为什么运行不了？

import java.util.*;
public class Main1{
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);  
        char n,m,k;
        while (sc.hasNextInt()){      
        n=(char) sc.nextInt();
        m=(char) sc.nextInt();
        k=(char) sc.nextInt();
        if(n>m)
        {
       if(m>k)
        {
       System.out.print(n+ +m+ +k);   }  
       else {
           System.out.print(n+ +k+ +m);  
       }
        }
       else {
           if(n>k)
           {
          System.out.print(m+ +n+ +k);   }  
          else {
              System.out.print(m+ +k+ +n);  
       }
       }         
      
        }
   
    }
}