# Enter your code here. Read input from STDIN. Print output to STDOUT
from fractions import Fraction

table=['r','r']+['b' for i in range(8)]
table2 = list(table)
print(table)

count=0
total=0

for i in table:
    table2 = list(table)    
    table2.remove(i)
    for j in table2:
        table3 = list(table)    
        table3.remove(i)
        table3.remove(j)
        for k in table3:
            draw=i+j+k
            #print(draw)
            if any([m in draw for m in ['rrb','brr']]):
                print(draw,[m in draw for m in ['rrb','brr']])
                count+=1
            total+=1
            
print(Fraction(count, total))