Description

Xiao Ming has recently become very interested in probability problems. One day, Xiao Ming and Xiao Hong played a probability game together. First, Xiao Ming provides a letter and a word, and then Xiao Hong calculates the probability of that letter appearing in the word. The letter is case-insensitive.
For example, if the given letter is a and the word is apple, the probability is 0.20000.

Input Format

The input contains multiple test cases. Each test case consists of a letter and a word. The length of the word does not exceed 200.

Output Format

For each input, output the corresponding probability, rounded to 5 decimal places.

a apple
c Candy
a banana

0.20000
0.20000
0.50000

译文

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