Language: Java

import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String str = scan.nextLine();
    if(str == a ||
       str == b ||
       str == c ||
       str == d ||
       str == e ||
       str == f ||
       str == g ||
       str == h ||
       str == i ||
       str == j ||
       str == k ||
       str == l ||
       str == m ||
       str == n ||
       str == o ||
       str == p ||
       str == q ||
       str == r ||
       str == s ||
       str == t ||
       str == u ||
       str == v ||
       str == w ||
       str == x ||
       str == y ||
       str == z
       ){
      System.out.println("a");
    }else{
      System.out.println("A");
    }
  }
}
       
       
    



Compiler output:
Main.java:7: error: cannot find symbol
    if(str == a ||
              ^
  symbol:   variable a
  location: class Main
Main.java:8: error: cannot find symbol
       str == b ||
              ^
  symbol:   variable b
  location: class Main
Main.java:9: error: cannot find symbol
       str == c ||
              ^
  symbol:   variable c
  location: class Main
Main.java:10: error: cannot find symbol
       str == d ||
              ^
  symbol:   variable d
  location: class Main
Main.java:11: error: cannot find symbol
       str == e ||
              ^
  symbol:   variable e
  location: class Main
Main.java:12: error: cannot find symbol
       str == f ||
              ^
  symbol:   variable f
  location: class Main
Main.java:13: error: cannot find symbol
       str == g ||
              ^
  symbol:   variable g
  location: class Main
Main.java:14: error: cannot find symbol
       str == h ||
              ^
  symbol:   variable h
  location: class Main
Main.java:15: error: cannot find symbol
       str == i ||
              ^
  symbol:   variable i
  location: class Main
Main.java:16: error: cannot find symbol
       str == j ||
              ^
  symbol:   variable j
  location: class Main
Main.java:17: error: cannot find symbol
       str == k ||
              ^
  symbol:   variable k
  location: class Main
Main.java:18: error: cannot find symbol
       str == l ||
              ^
  symbol:   variable l
  location: class Main
Main.java:19: error: cannot find symbol
       str == m ||
              ^
  symbol:   variable m
  location: class Main
Main.java:20: error: cannot find symbol
       str == n ||
              ^
  symbol:   variable n
  location: class Main
Main.java:21: error: cannot find symbol
       str == o ||
              ^
  symbol:   variable o
  location: class Main
Main.java:22: error: cannot find symbol
       str == p ||
              ^
  symbol:   variable p
  location: class Main
Main.java:23: error: cannot find symbol
       str == q ||
              ^
  symbol:   variable q
  location: class Main
Main.java:24: error: cannot find symbol
       str == r ||
              ^
  symbol:   variable r
  location: class Main
Main.java:25: error: cannot find symbol
       str == s ||
              ^
  symbol:   variable s
  location: class Main
Main.java:26: error: cannot find symbol
       str == t ||
              ^
  symbol:   variable t
  location: class Main
Main.java:27: error: cannot find symbol
       str == u ||
              ^
  symbol:   variable u
  location: class Main
Main.java:28: error: cannot find symbol
       str == v ||
              ^
  symbol:   variable v
  location: class Main
Main.java:29: error: cannot find symbol
       str == w ||
              ^
  symbol:   variable w
  location: class Main
Main.java:30: error: cannot find symbol
       str == x ||
              ^
  symbol:   variable x
  location: class Main
Main.java:31: error: cannot find symbol
       str == y ||
              ^
  symbol:   variable y
  location: class Main
Main.java:32: error: cannot find symbol
       str == z
              ^
  symbol:   variable z
  location: class Main
26 errors