题解 | BFS

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner=new Scanner(System.in);
		String string=scanner.next().toUpperCase();
		System.out.println(string.indexOf("BOB"));

	}

}

首先通过toUpperCase将输入的字符串转换为大写，再通过indexOf获得位置即可