CF677C.Vanya and Label
普及/提高-
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题目描述
While walking down the street Vanya saw a label "Hide&Seek". Because he is a programmer, he used & as a bitwise AND for these two words represented as a integers in base 64 and got new word. Now Vanya thinks of some string s and wants to know the number of pairs of words of length ∣s∣ (length of s ), such that their bitwise AND is equal to s . As this number can be large, output it modulo 109+7 .
To represent the string as a number in numeral system with base 64 Vanya uses the following rules:
- digits from '0' to '9' correspond to integers from 0 to 9 ;
- letters from 'A' to 'Z' correspond to integers from 10 to 35 ;
- letters from 'a' to 'z' correspond to integers from 36 to 61 ;
- letter '-' correspond to integer 62 ;
- letter '_' correspond to integer 63 .
输入格式
The only line of the input contains a single word s ( 1<=∣s∣<=100000 ), consisting of digits, lowercase and uppercase English letters, characters '-' and '_'.
输出格式
Print a single integer — the number of possible pairs of words, such that their bitwise AND is equal to string s modulo 109+7 .
输入输出样例
输入#1
z
输出#1
3
输入#2
V_V
输出#2
9
输入#3
Codeforces
输出#3
130653412
说明/提示
For a detailed definition of bitwise AND we recommend to take a look in the corresponding article in Wikipedia.
In the first sample, there are 3 possible solutions:
- z&_=61&63=61=z
- _&z=63&61=61=z
- z&z=61&61=61=z