# your code goes here
a=int(input())
b=int(input())
k=[]
for i in range(a,b+1):
if i == 1:
continue
for j in range(2,i):
if i % j == 0:
break
else:
k.append(i)
if(len(k)==0):
print('-1')
else:
sumk=sum(k)
print(sumk)
print(k[0])
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmE9aW50KGlucHV0KCkpCmI9aW50KGlucHV0KCkpCms9W10KCmZvciBpIGluIHJhbmdlKGEsYisxKToKCWlmIGkgPT0gMToKCQljb250aW51ZQoJZm9yIGogaW4gcmFuZ2UoMixpKToKCQlpZiBpICUgaiA9PSAwOgoJCQlicmVhawoJZWxzZToKCSAgay5hcHBlbmQoaSkKCmlmKGxlbihrKT09MCk6CglwcmludCgnLTEnKQoKZWxzZToKCXN1bWs9c3VtKGspCglwcmludChzdW1rKQoJcHJpbnQoa1swXSk=