def water_type(temp):
    '''Print either solid or liquid depending on the
    water temperature.'''
    
    # version 1
    if temp < 32:
        print('solid')
    elif temp > 212:
        print('gas')
    else:
        print('liquid')

    # version 2
    if temp > 212:
        print('gas')
    elif temp < 32 :
        print('solid')
    else:
        print('liquid')    
    
    # version 3 
    if temp > 32 and temp < 212:
        print('liquid')
    elif temp > 212:
        print('gas')
    else:
        print('solid')


def driver_check(age, road_test):
    '''Print whether someone of the given age can drive.
    Signature: (int, bool) --> None'''
    if age >= 16 and road_test:
        print('yes, can drive')
    elif age >= 15:
        print('learner\'s permit only')
    else:
        print('no, can\'t drive')
        

def letter_grade(score):
    '''Return the letter grade corresponding to the given score.
    Signature: (int) --> str'''
    if score >= 90:
        return 'A'
    elif score >= 80:
        return 'B'
    elif score >= 70:
        return 'C'
    elif score >= 60:
        return 'D'
    else:
        return 'F'