#include<stdio.h>
int main(){
    char max,mid,min;
    char a,b,c;
    while(scanf("%c%c%c",&a,&b,&c)!=EOF){
        getchar();//取回车字符
        if(a>b){
            if(a>c){
                max=a;
                mid=(b>c)?b:c;
                min=(b<c)?b:c;
            }
            else{
                max=c;
                mid=a;
                min=b;
            }
        }
        else{
            if(a>c){
                max=b;
                mid=a;
                min=c;
            }
            else{
                max=(b>c)?b:c;
                mid=(b<c)?b:c;
                min=a;
            }
        }
        printf("%c %c %c\n",min,mid,max);
    }
    return 0;
}

【转】网上代码参考：http://blog.sina.com.cn/s/blog_6fb54b980100n3pn.html