Problem:
Score : 100 points

Problem Statement

Given is a lowercase English letter C that is not z. Print the letter that follows C in alphabetical order.

Constraints

C is a lowercase English letter that is not z.

Input

Input is given from Standard Input in the following format:

C

Output

Print the letter that follows C in alphabetical order.

Sample Input 1

a

Sample Output 1

b

a is followed by b.

Sample Input 2

y

Sample Output 2

z

y is followed by z.

Solution in Rust (1.15.1) (judge verdict: Accepted)

fn main() {
    let alphabet = "abcdefghijklmnopqrstuvwxyz";

    let mut buf = String::new();
    std::io::stdin().read_line(&mut buf).unwrap();
    let ch = buf.chars().nth(0).unwrap();

    println!("{}", alphabet.chars().nth(alphabet.find(ch).unwrap() + 1).unwrap());
}