抓老鼠啊~亏了还是赚了？

include<stdio.h>

int main()
{

int happy=0,sad=0,unhappy=0,a=0,b=0;
char op;

while((op=getchar())!='$'){

if(sad&&!happy){
  
  sad--;
  printf("-");
  
  
}
else{
	if(unhappy&&!happy){
		unhappy--;
		printf("-");
	}
    else{
	  if(happy)  happy--;
      
      switch(op)
      {
        case 'T':printf("D");a++;sad=2;break;
        case 'C':printf("!");b++;happy=2;break;
        case 'X':printf("U");unhappy=1;break;
      }
      
    }    
}

}
printf("\n");
printf("%d",7a-3b);
return 0;
}