# 0 Arguments
def countdown_from_10():
    for i in range(10, 0, -1):
        print i
    print "Blast Off!"

# 1 Argument
def combine_strings(list_of_strings):
    out_string = ""
    for string in list_of_strings:
        out_string = out_string + string
    return out_string

# 2 Arguments
def euclidean_distance(delta_x, delta_y):
    dist_squared = delta_x**2 + delta_y**2
    return (dist_squared)**(.5)