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 Java (OpenJDK 11.0.6) (judge verdict: Runtime Error)

import java.util.*;
class Main{
  public static void main(String[] args){
Scanner sc=new Scanner(System.in);
		    int n=sc.nextInt();
		    int sum=0;
		    Map<Integer,Integer> m=new HashMap<>();
		    for(int i=0;i<n;i++){
		    		int c=sc.nextInt();
		    		sum+=c;
		    		if(!m.containsKey(c)) {
		    			m.put(c,1);
		    		}else {
		    			m.put(c,m.get(c)+1);
		    		}
		    }int k=sc.nextInt();
		    for(int i=0;i<k;i++) {
		    	 int prev=sc.nextInt();
				    int fill=sc.nextInt();
				    if(m.containsKey(prev)) {
				    int g=m.get(prev);
				    sum=sum-prev*g;
				    sum=sum+fill*g;
				  				    m.remove(prev);
				    
				    if(!m.containsKey(fill)) {
		    			m.put(fill,g);
		    		}else {
		    			m.put(fill,m.get(fill)+g);
		    		}
				    
                    }
				    System.out.println(sum);
		    }
		    
		   
		 

  }
    
  }