# Bai 3.1
print('Bai 3.1\n')
input = 24
s = str(bin(input))
print('Chuoi binary ',s)
a = s.rindex('1')
print('Thu tu cua so 1 la',a)
print('Phan tu so 1 cuoi cung ben phai la ',s[-a-1:])
print('#'*70+'\n')
# Bai 3.2
print('Bai 3.2\n')
s = 13
print('So nguyen ',s)
if s>0:
print('This is positive number')
elif s<0:
print('This is negative number')
else:
print('This is zero')
print('#'*70+'\n')
# Bai 3.3
print('Bai 3.3\n')
input3 = 'ccecec.ecewc.dfg'
print('File thong tin ',input3)
a3 = input3.rindex('.')
print('Phan mo rong :',input3[a3:])
print('#'*70+'\n')
# Bai 3.4
print('Bai 3.4\n')
input4 = list(range(6,13))
print('Chuoi so lieu',input4)
if len(input4)%2 ==1:
a4 = int(len(input4)/2)+1
else:
a4 = int(len(input4)/2)
i=0
while i<=a4:
print(input4[i],'\t',input4[a4+i])
i = i+1
print('#'*70+'\n')
# Bai 3.5
