You are given four following results:
1111 = F
2222 = E
3333 = T

Then, can you find out how to code 4444 ?

sixteen

It is simple.
1 + 1 + 1 + 1 = Four
2 + 2 + 2 + 2 = Eight
3 + 3 + 3 + 3 = Twelve
4 + 4 + 4 + 4 = Sixteen