8610. Previous and next letter

A letter of the English alphabet is given. Print its previous and next letter.

Input. One letter с (‘A’ < c < ‘Z’ or ‘a’ < c < ‘z’) of the English alphabet (lowercase or uppercase).

Output. Print the letter that precedes c, followed by the letter that comes after c in the English alphabet (preserving the case).

Sample input 1	Sample output 1
D	C E
Sample input 2	Sample output 2
X	w y

SOLUTIONS

chars

Algorithm analysis

Let c be the input character. Print the characters c – 1 and c + 1.

Algorithm realization

Read the input symbol c.

scanf("%c", &c);

Print the symbols c – 1 and c + 1.

printf("%c %c\n", c - 1, c + 1);

Python realization

Read the input symbol c.

c = input()

Compute and print the symbols prev = c – 1 and next = c + 1.

prev = chr(ord(c) - 1)

next = chr(ord(c) + 1)

print(prev, next)