Language: Java

import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    String α = 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 str
  location: class Main
Main.java:8: error: cannot find symbol
       str == "b" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:9: error: cannot find symbol
       str == "c" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:10: error: cannot find symbol
       str == "d" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:11: error: cannot find symbol
       str == "e" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:12: error: cannot find symbol
       str == "f" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:13: error: cannot find symbol
       str == "g" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:14: error: cannot find symbol
       str == "h" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:15: error: cannot find symbol
       str == "i" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:16: error: cannot find symbol
       str == "j" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:17: error: cannot find symbol
       str == "k" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:18: error: cannot find symbol
       str == "l" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:19: error: cannot find symbol
       str == "m" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:20: error: cannot find symbol
       str == "n" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:21: error: cannot find symbol
       str == "o" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:22: error: cannot find symbol
       str == "p" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:23: error: cannot find symbol
       str == "q" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:24: error: cannot find symbol
       str == "r" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:25: error: cannot find symbol
       str == "s" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:26: error: cannot find symbol
       str == "t" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:27: error: cannot find symbol
       str == "u" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:28: error: cannot find symbol
       str == "v" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:29: error: cannot find symbol
       str == "w" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:30: error: cannot find symbol
       str == "x" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:31: error: cannot find symbol
       str == "y" ||
       ^
  symbol:   variable str
  location: class Main
Main.java:32: error: cannot find symbol
       str == "z"
       ^
  symbol:   variable str
  location: class Main
26 errors