PROGRAMMING:JMU DS simple password

Julius Caesar used to use a very simple password. For each character in plaintext, replace it with the corresponding character of the last five digits in its alphabet to get ciphertext. For example, the character a is replaced by F. The following is the correspondence between the characters in ciphertext and plaintext.
ciphertext
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Plaintext
V W X Y Z A B C D E F G H I J K L M N O P Q R S T U
Your task is to decrypt the given ciphertext to get plaintext.
What you need to note is that all the letters in the ciphertext are capital letters
letter. The ciphertext also includes non alphabetic characters, which need not be decoded.
###Input format:
Enter a line of ciphertext string that can contain spaces.
###Output format:
Output a clear text string. When the input plaintext string is empty, output "null"
###Input example:
```in
AB 12aC dab EF
```
###Output example:
```out
VW 12aX dab ZA
```






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