#Lutece0250. windy数

windy数

Migrated from Lutece 250 windy数

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Description

windy定义了一种windy数。

不含前导零且相邻两个数字之差至少为22的正整数被称为windy数。

windy想知道,在AABB之间,包括AABB,总共有多少个windy数?

Input

包含两个整数,AA BB

满足 1AB20000000001 \leq A \leq B \leq 2000000000 .

Output

Samples

1 10
9

Resources

Windy