Problem:
Score : 100 points

Problem Statement

An uppercase or lowercase English letter \alpha will be given as input.
If \alpha is uppercase, print A; if it is lowercase, print a.

Constraints

\alpha is an uppercase (A - Z) or lowercase (a - z) English letter.

Input

Input is given from Standard Input in the following format:

α

Output

If \alpha is uppercase, print A; if it is lowercase, print a.

Sample Input 1

B

Sample Output 1

A

B is uppercase, so we should print A.

Sample Input 2

a

Sample Output 2

a

a is lowercase, so we should print a.

Solution in Go (1.14.1) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"unicode"
)

func main() {
	var wtr = bufio.NewWriter(os.Stdout)
	var alpha string
	fmt.Scan(&alpha)
	r := rune(alpha[0])
	var ans string
	if unicode.IsUpper(r) {
		ans = "A"
	} else {
		ans = "a"
	}
	fmt.Fprintln(wtr, ans)
	_ = wtr.Flush()
}