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 C++ (GCC 9.2.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
#define INFTY 1<<20
#define rep(i,n) for (int i = 0; i < (n); ++i)
typedef long long int ll;
using ipair = pair<int,int>;
bool operator< (const ipair a, const ipair b){return a.first < b.first;};
const int MOD=1000000007;


int main(){  
    string s1;
    cin>>s1;
    if(s1[0] >= 'a' && s1[0] <= 'z'){
    cout << "a" << endl;

//文字が英大文字かどうか判定
    }else if(s1[0] >= 'A' && s1[0] <= 'Z'){
    cout << "A" << endl;
    }
    
    return 0;
}