#question 6

#8,9 : 7,12 : 2,13 : 1,8 : 1,5 :
#check
a = 8
b = 9
for i in range(5):
    c = b + 2*a
    print(a,b,sep=",", end = " : ")
    b = c//2
    a = a - c%a