my_string = 'yukiko_yukiko_miho_osaka_kyoto'
print(my_string[2:4])

print('O_O' * 70)

print(my_string[::-1])

print('_O_O_' * 50)

print(my_string[1::2])
print(my_string[1:10:3])
print(my_string[2::2])
print(my_string[::4])

