Previous and next letter

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

Input

One letter $с{(}^{\prime }{A}^{\prime }<c{<}^{\prime }{Z}^{\prime }$ or ${}^{\prime }{a}^{\prime }<c{<}^{\prime }{z}^{\prime })$ 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).

Examples