Problema fara sens

#include <iostream>

using namespace std;

int main()
{
    long long a, b, min=99, max=0, ca, cb, y, x, d;
    do{cin>>a>>b;
      }
        while(a<=10000000000000 && b<=10000000000000);
        {
            x=a;
            y=b;
            while(x)
            {
                y=b;
                ca=x%10;
                if(ca)
                    while(y)
                {
                    cb=y%10;
                    d=ca*10+cb;
                    if(min>d)
                        min=d;
                    if(max<d)
                        max=d;
                    y/=10;
                }
             y/=10;
            }
         x/=10;
         y=b;
        }
        while(y)
        {
            x=a;
            cb=y%10;
            if(cb)
                while(x)
            {
                ca=x%10;
                d=cb*10+ca;
                if(min>d)
                    min=d;
                if(max<d)
                    max=d;
                x/=10;
            }
         y/=10;
        }

    return 0;
}