Find the Missing Letter

You are given a sequence of consecutive English alphabet letters with exactly one missing letter. The letters are either all uppercase or all lowercase. Your task is to determine and output the missing letter.

The sequence is provided as space-separated characters on a single line. You should read the input from stdin and print the result to stdout.

If all the letters are consecutive and no letter is missing, print No missing letter found.

Note: For any arithmetic related to characters, you may use the ASCII value function, e.g., \(\text{ord}(x)\) in Python or similar in other languages.

inputFormat

The input consists of a single line containing space-separated characters. Each character represents a letter in the sequence. For example:

a b c d f

outputFormat

Output a single line containing the missing letter. If the sequence contains no missing letter, output "No missing letter found".## sample

a b c d f

e