The Almost Lucky Numbers(Harder)

题目描述

John and Brus believe that the digits 4 and 7 are lucky and all others are not. According to them, an almost lucky number is a number that contains at most one non-lucky digit in its decimal representation. Return the total number of almost lucky numbers between a and b, inclusive.

输入说明

Each line contains two integers a,b<=10^16

输出说明

For each line of input,output the total number of almost lucky numbers between a and b, inclusive.

样例

输入

4 7
8 19

输出

4
4