Description

請撰寫一個程式, 找出輸入的是第幾個字母。

Please write a program to determine the position of the input character in the alphabet.

Input

輸入包含一個字元 c。

The input contains a character c.

Output

請輸出該字元是第幾個字母，若不是字母請輸出 "Not a letter."。

Please output the position of the letter in the alphabet. If it's not a letter, please output "Not a letter."

Sample Input 1

c

Sample Output 1

3

Sample Input 2

C

Sample Output 2

3

Sample Input 3

<

Sample Output 3