what is the difference between the largest number and the least number written with the digits 7 , 3 , 1 , 4 ?
"1347 7431 - - - - - - - - - - - - 6084 answer : a"
subtract(add(add(add(multiply(multiply(7, const_100), const_10), multiply(4, const_100)), multiply(3, const_10)), 1), add(add(add(const_1000, multiply(3, const_100)), multiply(4, const_10)), 7))