Preceding Characters Transformation

You are given a string S consisting of lowercase English letters. Your task is to transform the string by replacing each character with its preceding character in the English alphabet. Note that if the character is a, it should wrap around to z.

For example, if S = "abc", the transformed string should be "zab" because:

• 'a' becomes 'z'
• 'b' becomes 'a'
• 'c' becomes 'b'

Hint: For a character c not equal to 'a', its preceding character can be calculated using the formula: \( \text{prev}(c) = \text{chr}(\text{ord}(c) - 1) \).

inputFormat

Input is provided via standard input (stdin). It consists of a single line that contains a non-empty string S made up of lowercase English letters.

outputFormat

Print to standard output (stdout) a single line representing the transformed string after replacing each character with its preceding character (with 'a' replaced by 'z').## sample

abc

zab