def string_form_first_2_and_last_2(str):
if len(str) < 2:
return ''
return str[0:2] + str[-2:]
print(string_form_first_2_and_last_2('python'))
print(string_form_first_2_and_last_2('ab'))
print(string_form_first_2_and_last_2('q'))
'''
run:
pyon
abab
'''