import math as m

# list mutable

# a = ['deep',410,'dalsania',10.4]

# string

# a = 'Deep Dalsania'

# set it doesn't follow a sequence

#a = {'deep',410,'dalsania',10.4}

# tuple immutable

#a = ('deep',410,'dalsania',10.4)

# default increment is 1

'''for i in a :

print(i)'''

'''for i in ['deep',410,'dalsania',10.4] :

print(i)'''

'''for i in range(10) :

print(i)'''

'''for i in range(11,20,2) :

print(i)'''

# reverse

'''for i in range(20,10,-2) :

print(i)'''

'''for i in range(1,51) :

if (i % 5 != 0) :

print(i)'''

# code for finding perfect root

'''for i in range(1,501) :

a = int (m.sqrt(i))

if(i == a*a):

print(i,' is a perfect square number because %d * %d = %d'%(a,a,i))

else:

print(i,' is not perfect square number')'''

a = ['abc','def','g','hi']

for i in range(4):

print(i,a[i])