Start with any positive integer, replace the number by the sum of the squares of its digits in base-ten, and repeat the process until the number either equals 1 (where it will stay), or it loops endlessly in a cycle that include number 4. Those numbers for which this process ends in 1 are called happy numbers, others are unhappy or sad numbers.
Examples:
208 -> 2*2 + 8*8 = 68 -> 6*6 + 8*8 = 100 -> 1*1 = 1 ---> HAPPY NUMBER :)
145 -> 1*1 + 4*4 + 5*5 = 42 -> 4*4 + 2*2 = 20 -> 2*2 = 4 ---> SAD NUMBER :(

Write a program that gets a number and says if it is happy or not.