JAVA
java
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import java.util.Scanner;
public class SplitByChangingChar{
static int i=0;
public static void main(String...arg){
String s=new Scanner(System.in). nextLine();
s.chars().forEach(c-> {System.out. print(((i==0||i==c)?"":"\n")+(char) c);i=c;});
}
}
// using regex:
// System.out.print(String.join ("\n",new Scanner(System.in).nextLine ().split("s+|(?<=([\\w\\d\\W\\s]))(?=[\\w\\d\\W\\s])(?!\\1)")));
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OUTPUT
Run