Wassi and Tahseen are two young brothers who are just learning the English alphabets, still the uppercase letters only. Their teacher wanted to test how much they have learned so far. As a result, she prepared a string of capital letters where some of the letters are missing.
The teacher wanted to see if her students can find out the total numbers of letters are missing. Now, since Wassi and Tahseen are too young to write a program, our teacher can not ask them to write one.
So can you help out our teacher here by writing a small program that will help her to determine if her two little students got the count of missing letters right.
The input will contain a string S (0 <|S|<=1000).
Just print the answer in a single line.
Input will be only english uppercase letter.