output checking failure

package zh.codegym.task.task08.task0828; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.HashSet; import java.util.List; import java.util.Set; /* 月份编号 */ public class Solution { public static void main(String[] args) throws IOException { //在此编写你的代码 BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String m = reader.readLine(); ArrayList<String> list = new ArrayList<String>(); list.add("January"); list.add("February"); list.add("March"); list.add("April"); list.add("May"); list.add("June"); list.add("July"); list.add("Aguest"); list.add("September"); list.add("October"); list.add("November"); list.add("December"); int i = list.indexOf(m)+1; System.out.println(m+" 是第 "+i+" 个月 "); } }