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public static void main(String[] args) {
/* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
Scanner sc=new Scanner(System.in);
String a=sc.next();
int k=sc.nextInt();
String max=a.substring(0,k);
String min=a.substring(0,k);
for(int i=0; i+k<=a.length(); i++){
if(a.substring(i, i+k).compareTo(min)<0) min=a.substring(i, i+k);
if(a.substring(i, i+k).compareTo(max)>0) max=a.substring(i, i+k);
}
System.out.println(min);
System.out.println(max);
}
Java Substring Comparisons
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import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;
public class n {
}