> #include<stdio.h>
> #include<algorithm>
> main()
> {int n,c,a,b,i,f,j,k,s[4];
> while(scanf("%d",&n)&&n!=-1)
> {c=0;
> printf("N=%d\n",n);
> while(1)
> {f=a=b=i=j=0;
> k=1;
> while(n)
> 	s[i++]=n%10,n/=10,j++;
> std::sort(s,s+j);
> for(i=0;i<j;i++)
> 	a+=s[i]*k,b+=s[j-i-1]*k,k*=10;
> n=a-b;
> c++;
> if(!n&&c==1||(c==1&&j!=4))
> 	{puts("No!!"),f=1;break;}
> printf("%d-%d=%d\n",a,b,n);
> if(n%6174==0)break;
> }
> if(!f)printf("Ok!! %d times\n",c);
> }
> }