s="ABCDEF";head=0;tail=0 que=[""]*100
for i in range(len(s)):
if i%2==0:
que[tail]=s[i]
else:
que[tail]=s[len(s)-i]
tail=tail+1
print(que[head],end="")
head=head+1
以上程序运行后,打印出列表的情况是:( )