Problem:
Score : 200 points

Problem Statement

We have a string S consisting of uppercase English letters. Additionally, an integer N will be given.

Shift each character of S by N in alphabetical order (see below), and print the resulting string.

We assume that A follows Z. For example, shifting A by 2 results in C (A \to B \to C), and shifting Y by 3 results in B (Y \to Z \to A \to B).

Constraints

0 \leq N \leq 26

1 \leq |S| \leq 10^4

S consists of uppercase English letters.

Input

Input is given from Standard Input in the following format:

N
S

Output

Print the string resulting from shifting each character of S by N in alphabetical order.

Sample Input 1

2
ABCXYZ

Sample Output 1

CDEZAB

Note that A follows Z.

Sample Input 2

0
ABCXYZ

Sample Output 2

ABCXYZ

Sample Input 3

13
ABCDEFGHIJKLMNOPQRSTUVWXYZ

Sample Output 3

NOPQRSTUVWXYZABCDEFGHIJKLM

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

use std::io::Write;
use std::collections::HashMap;

#[allow(unused)]
macro_rules! debug {
    ($($format:tt)*) => (write!(std::io::stderr(), $($format)*).unwrap());
}
#[allow(unused)]
macro_rules! debugln {
    ($($format:tt)*) => (writeln!(std::io::stderr(), $($format)*).unwrap());
}

fn main() {
    let n: u8 = {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).unwrap();
        let s = s.trim_right().to_owned();
        s.parse().unwrap()
    };


    let s = {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).unwrap();
        let s = s.trim_right().to_owned();
        s
    };

    let ans: String = s.chars().map(|c| shift(c, n)).collect();
    println!("{}", ans);
}

fn shift(c: char, n: u8) -> char {
    let a = 'A' as u8;
    let code_c = c as u8;
    let diff = code_c - a + n;
    (a + (diff % 26)) as char
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn one() {
        assert_eq!('B', shift('A', 1));
        assert_eq!('C', shift('B', 1));
    }

    #[test]
    fn two() {
        assert_eq!('C', shift('A', 2));
    }

    #[test]
    fn z() {
        assert_eq!('A', shift('Z', 1));
    }
}