include"stdio.h"

int main()
{
char a,b,c,t;
while(scanf("%c%c%c",&a,&b,&c)!=EOF)
if(b>a)
{t=b;
b=a;
a=t;}
if(b<c)
{t=c;
c=b;
b=t;}
if(a<c)
{t=c;
c=a;
a=t;}
printf("%c%c%c",a,b,c);
return 0;
}
请问这个怎么运行不出来啊

include"stdio.h"改成#include