let addition1 = arc4random_uniform(11)
let addition2 = arc4random_uniform(11)
var answer_a = (addition1, addition2)
print(" What is...")
sleep(3)
print (addition1)
sleep(2)
print(" Plus...")
sleep(2)
print(addition2)
let ans_a = input("")
else{
    print(" Sorry but that is wrong.")
    print(" Try again next time!")
}