Understanding Uninitialized Variables. It looks right to me, what's wrong?

Tell us what’s happening:

Your code so far

// Only change code below this line
var a; 5;
var b; 10;
var c; "I am a";
// Only change code above this line

a = a + 1;
b = b + 5;
c = c + "String!";

Challenge: Understanding Uninitialized Variables

Link to the challenge:

I’ve read posts elsewhere and the code looks correct, yet it is not going through. Help!

//Here's what your code should look like. 
var a = 5;
var b = 10;
var c = "I am a";