e=1e10.to_i
a,b=gets.split.map &:to_i
x=a
y=b
loop{c=a/e;a%=e
d=b/e;b%=e
c!=d&&(puts (c*d==28)?(c<d)?(x):(y):(c<d)?(y):(x);break)
e/=10}