#this is a code for practice question ceil and a-b problem.

a=int(input())

b=int(input())

if (a-b)//10==9 :

print((a-b)-1)

else :

print((a-b)+1)

#this is a code for practice question ceil and a-b problem.

a=int(input())

b=int(input())

if (a-b)//10==9 :

print((a-b)-1)

else :

print((a-b)+1)