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def printYanghui(n):
numbers = []
for line in range(n + 1):
numbers += [[]]
for i in range(n + 1):
numbers[line] += [0]
numbers[1][1] = 1
for line in range(2, n + 1):
for i in range(1, n + 1):
numbers[line][i] = numbers[line - 1][i] + numbers[line - 1][i - 1]
for line in range(1, n + 1):
for space in range(n - line):
print(" ", end='')
for i in range(1, line + 1):
print(numbers[line][i], end=" ")
print()
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list=eval(input())
y=[]
for i in range(0,len(list)):
if list[i] not in y:
y.append(list[i])
for j in range(0,len(y)-1):
print('%d'%y[j],end=' ')
print(y[-1])