# a=[1,2,3,4,5]
# i=1
# while i<=len(a):
#         print(i)
#         i=i+1

# a=[1,1,2,2,3,3]
# i=0
# pro=1
# while i<len(a):
#     j=i+1
#     while j<len(a):
#         if a[i]==a[j]:
#             del a[j]
#             pro=pro*a[i]

#         j=j+1
#     i=i+1
# print(a)
# print(pro)   