def handle(s): t = s.split() ret = [] for k,v in enumerate(t): if k<len(t)-1 and t[k+1] != v: ret.append(v) ret.append(t[-1]) return " ".join(ret)
str_list=input().spilt(' ')
for i in range(len(str_list)): #这里的长度评论里都是len-2,why?
if str_list[i]==str_list[i+1]:
del str_list[i+1]
print(' '.join(str_list))
#评论里还有另一种方法,看不懂?
error_str = "This is is a desk"
correct_str = []
for i in error_str.split():
if i not in correct_str:
correct_str.append(i)
print(" ".join(correct_str)) para = 'This is is a a desk desk.'.split(' ')
print(para)
d = []
for word in para:
if word not in d:
d.append(word)
print(' '.join(d))