Hi,
You can pick whatever number you want that has four digits with the same number in all places, such as 4.444 or 7777 or 333.3.
The digit with the greatest value is always the first one on the left, while the one with the least value is the first one on the right. It depends on how the decimal system works. For example, in the number 7777, the first digit on the left stands for 7 times 1000, while the second one for 7 times 100, the third one for 7 times 10 and the last one for 7 times 1. Likewise, 333.3 = 3x100 + 3x10 + 3x1 + 3x0.1
The same goes for every number you pick, except if the digit you choose is 0. In fact, other than making little sense, writing 0000 means that every digit has the same value, since 0x1000 =...= 0x1 = 0
Hope this helps! If my answer was not clear enough or you’d like further explanation please let me know. Also, English is not my first language, so I’m sorry for any mistakes.