杭电oj2000

 1 #include<stdio.h>
 2 void main()
 3 {
 4     char a,b,c,d;
 5     while(scanf("%c%c%c%c",&a,&b,&c,&d)!=EOF)
 6     {
 7         if(a>b)
 8         {
 9             d=a;a=b;b=d;
10         }
11         if(b>c)
12         {
13             d=b;b=c;c=d;
14         }
15         if(a>b)
16         {
17             d=a;a=b;b=d;
18         }
19 
20         printf("%c %c %c\n",a,b,c);
21     }
22 }