蓝桥杯-字符串对比 灵活运用String方法(JAVA)

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Scanner;


public class Main {
	static Scanner sc = new Scanner(new InputStreamReader(System.in));
        static OutputStreamWriter out = new OutputStreamWriter(System.out);
	public static void main(String[] args) throws Exception  {
		String s1 = sc.next();
		String s2 = sc.next();
		if(s1.length()!=s2.length()){
			out.write("1");
		}
		else {
			if(s1.equals(s2)){
				out.write("2");
			}
			else{
				if(s1.equalsIgnoreCase(s2)) out.write("3");
				else out.write("4");
			}
			
		}
		
        out.flush();
    }
}