View difference between Paste ID: wUE9ELuG and ApQ3pVb7

 import java.util.Scanner;
 
 public class Subsequence {
     public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         String key = input.nextLine();
         String code = input.nextLine();
         if(key.length()>code.length()){
             System.out.println(false);
         }
         else if(key.length()!=0){
             findKey(0, key, code, 0);
         }
 
 
 
     }
 
     private static void findKey(int index, String key, String code, int codeIndex) {
         StringBuilder sb = new StringBuilder();
         if (key.length() == index && codeIndex < code.length()) {
             System.out.println(true);
             return;
         }
         for (int i = codeIndex; i < code.length(); i++) {
             if (key.charAt(index) == code.charAt(i)) {
                 codeIndex = i;
                 sb.append(key.charAt(index));
                 findKey(index + 1, key, code, codeIndex);
                 return;
             }
 
         }
         System.out.println(false);
         return;
     }
 }