I have been on this problem for about 3 hours and I cannot solve it. My professor wanted us to make a command button with 3 input boxes ( I was able to do this part), but I'm suppose to design a boolean and select case that makes sure that a 5 digit number is entered in one of the input boxes are there will be errors. I cannot do it. Please help.

Question

I have been on this problem for about 3 hours and I cannot solve it. My professor wanted us to make a command button with 3 input boxes ( I was able to do this part),  but I'm suppose to design a boolean and select case that makes sure that a 5 digit  number is entered in one of the input boxes are there will be errors. I cannot do it. Please help.