ASCII码排序

#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;

int main()
{
	char c, a[3];
	int i = 0;
	
	while(~scanf("%c", &c))
	{
		a[i] = c;
		
		if(i == 3) 
		{
			sort(a, a + 3);
			for(int j = 0; j < 3; ++ j)
			{
				if(j == 2)	printf("%c\n", a[j]);
				else	printf("%c ", a[j]);
			}
			i = 0;
		}
		else
		{
			i ++;
		}
	}
	
	return 0;
}